Adjustments for grouped drop bonus chance.

L2J_Mobius_01.0_Ertheia/dist/game/config/Rates.ini

@@ -109,6 +109,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_01.0_Ertheia/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -757,18 +757,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -776,15 +775,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -823,74 +816,99 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
 					
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -914,6 +932,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1026,18 +1045,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1079,7 +1103,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1087,11 +1110,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_02.5_Underground/dist/game/config/Rates.ini

@@ -109,6 +109,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_02.5_Underground/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -757,18 +757,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -776,15 +775,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -823,74 +816,99 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
 					
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -914,6 +932,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1026,18 +1045,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1079,7 +1103,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1087,11 +1110,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_03.0_Helios/dist/game/config/Rates.ini

@@ -112,6 +112,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_03.0_Helios/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -757,18 +757,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -776,15 +775,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -823,74 +816,99 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
 					
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -914,6 +932,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1026,18 +1045,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1079,7 +1103,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1087,11 +1110,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_04.0_GrandCrusade/dist/game/config/Rates.ini

@@ -112,6 +112,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_04.0_GrandCrusade/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -757,18 +757,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -776,15 +775,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -823,74 +816,99 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
 					
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -914,6 +932,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1026,18 +1045,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1079,7 +1103,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1087,11 +1110,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_05.0_Salvation/dist/game/config/Rates.ini

@@ -112,6 +112,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_05.0_Salvation/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -757,18 +757,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -776,15 +775,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -823,74 +816,99 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
 					
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -914,6 +932,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1026,18 +1045,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1079,7 +1103,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1087,11 +1110,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_05.5_EtinasFate/dist/game/config/Rates.ini

@@ -112,6 +112,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_05.5_EtinasFate/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -757,18 +757,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -776,15 +775,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -823,74 +816,99 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
 					
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -914,6 +932,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1026,18 +1045,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1079,7 +1103,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1087,11 +1110,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_06.0_Fafurion/dist/game/config/Rates.ini

@@ -112,6 +112,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_06.0_Fafurion/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -757,18 +757,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -776,15 +775,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -823,74 +816,99 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
 					
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -914,6 +932,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1026,18 +1045,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1079,7 +1103,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1087,11 +1110,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_07.0_PreludeOfWar/dist/game/config/Rates.ini

@@ -112,6 +112,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_07.0_PreludeOfWar/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -757,18 +757,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -776,15 +775,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -823,74 +816,99 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
 					
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -914,6 +932,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1026,18 +1045,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1079,7 +1103,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1087,11 +1110,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_08.2_Homunculus/dist/game/config/Rates.ini

@@ -112,6 +112,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_08.2_Homunculus/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -757,18 +757,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -776,15 +775,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -823,74 +816,99 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
 					
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -914,6 +932,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1026,18 +1045,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1079,7 +1103,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1087,11 +1110,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_09.2_ReturnOfTheQueenAnt/dist/game/config/Rates.ini

@@ -112,6 +112,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_09.2_ReturnOfTheQueenAnt/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -757,18 +757,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -776,15 +775,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -823,74 +816,99 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
 					
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -914,6 +932,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1026,18 +1045,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1079,7 +1103,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1087,11 +1110,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_10.2_MasterClass/dist/game/config/Rates.ini

@@ -112,6 +112,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_10.2_MasterClass/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -757,18 +757,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -776,15 +775,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -823,74 +816,99 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
 					
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -914,6 +932,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1026,18 +1045,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1079,7 +1103,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1087,11 +1110,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_10.3_MasterClass/dist/game/config/Rates.ini

@@ -112,6 +112,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_10.3_MasterClass/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -757,18 +757,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -776,15 +775,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -823,74 +816,99 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
 					
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -914,6 +932,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1026,18 +1045,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1079,7 +1103,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1087,11 +1110,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_CT_0_Interlude/dist/game/config/Rates.ini

@@ -97,6 +97,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_CT_0_Interlude/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -696,18 +696,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -715,15 +714,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -763,70 +756,96 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 						}
 					}
 					
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -850,6 +869,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -962,18 +982,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1021,6 +1046,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 			return new ItemHolder(itemId, (int) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_CT_2.4_Epilogue/dist/game/config/Rates.ini

@@ -97,6 +97,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_CT_2.4_Epilogue/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -696,18 +696,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -715,15 +714,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -763,70 +756,96 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 						}
 					}
 					
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -850,6 +869,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -962,18 +982,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1021,6 +1046,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_CT_2.6_HighFive/dist/game/config/Rates.ini

@@ -98,6 +98,7 @@ DropChanceMultiplierByItemId = 57,1;21747,0;21748,0;21749,0
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_CT_2.6_HighFive/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -696,18 +696,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -715,15 +714,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -763,70 +756,96 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 						}
 					}
 					
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -850,6 +869,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -962,18 +982,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1021,6 +1046,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_Classic_1.0/dist/game/config/Rates.ini

@@ -109,6 +109,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_Classic_1.0/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -757,18 +757,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -776,15 +775,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -823,74 +816,99 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
 					
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -914,6 +932,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1026,18 +1045,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1079,7 +1103,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1087,11 +1110,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_Classic_1.5_AgeOfSplendor/dist/game/config/Rates.ini

@@ -109,6 +109,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_Classic_1.5_AgeOfSplendor/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -758,18 +758,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -777,15 +776,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -824,74 +817,99 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
 					
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -915,6 +933,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1101,18 +1120,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1154,7 +1178,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1162,11 +1185,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_Classic_2.0_Saviors/dist/game/config/Rates.ini

@@ -109,6 +109,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_Classic_2.0_Saviors/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -758,18 +758,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -777,15 +776,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -824,74 +817,99 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
 					
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -915,6 +933,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1101,18 +1120,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1154,7 +1178,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1162,11 +1185,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_Classic_2.5_Zaken/dist/game/config/Rates.ini

@@ -109,6 +109,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_Classic_2.5_Zaken/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -758,18 +758,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -777,15 +776,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -824,74 +817,99 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
 					
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -915,6 +933,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1101,18 +1120,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1154,7 +1178,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1162,11 +1185,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_Classic_2.7_Antharas/dist/game/config/Rates.ini

@@ -109,6 +109,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_Classic_2.7_Antharas/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -758,18 +758,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -777,15 +776,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -824,74 +817,99 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
 					
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -915,6 +933,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1101,18 +1120,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1154,7 +1178,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1162,11 +1185,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_Classic_2.8_SevenSigns/dist/game/config/Rates.ini

@@ -109,6 +109,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_Classic_2.8_SevenSigns/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -773,18 +773,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -792,15 +791,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -839,74 +832,99 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
 					
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -930,6 +948,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1116,18 +1135,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1169,7 +1193,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1177,11 +1200,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_Classic_2.9.5_Saviors/dist/game/config/Rates.ini

@@ -109,6 +109,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_Classic_2.9.5_Saviors/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -773,18 +773,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -792,15 +791,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -839,74 +832,99 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
 					
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -930,6 +948,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1116,18 +1135,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1169,7 +1193,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1177,11 +1200,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_Classic_2.9_SecretOfEmpire/dist/game/config/Rates.ini

@@ -109,6 +109,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_Classic_2.9_SecretOfEmpire/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -773,18 +773,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -792,15 +791,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -839,74 +832,99 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
 					
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -930,6 +948,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1116,18 +1135,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1169,7 +1193,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1177,11 +1200,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_Classic_3.0_TheKamael/dist/game/config/Rates.ini

@@ -109,6 +109,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_Classic_3.0_TheKamael/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -773,18 +773,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -792,15 +791,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -839,74 +832,99 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
 					
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -930,6 +948,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1116,18 +1135,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1169,7 +1193,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1177,11 +1200,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_Classic_Interlude/dist/game/config/Rates.ini

@@ -109,6 +109,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_Classic_Interlude/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -757,18 +757,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -776,15 +775,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -823,74 +816,99 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
 					
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
-					}
-					
-					// calculate if item will drop
 						totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					}
+					else
 					{
-						continue;
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -914,6 +932,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1026,18 +1045,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1079,7 +1103,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1087,11 +1110,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_Essence_4.2_DwellingOfSpirits/dist/game/config/Rates.ini

@@ -109,6 +109,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_Essence_4.2_DwellingOfSpirits/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -772,18 +772,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -791,15 +790,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -838,74 +831,103 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
-			
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					if (item.getId() == Inventory.LCOIN_ID)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
+						rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE_LCOIN, 1);
 					}
 					
-					// calculate if item will drop
-					totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-						continue;
+						totalChance += dropItem.getChance();
+					}
+					else
+					{
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -929,6 +951,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1041,18 +1064,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1094,7 +1122,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1102,11 +1129,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_Essence_5.2_FrostLord/dist/game/config/Rates.ini

@@ -109,6 +109,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_Essence_5.2_FrostLord/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -772,18 +772,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -791,15 +790,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -838,74 +831,103 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
-			
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					if (item.getId() == Inventory.LCOIN_ID)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
+						rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE_LCOIN, 1);
 					}
 					
-					// calculate if item will drop
-					totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-						continue;
+						totalChance += dropItem.getChance();
+					}
+					else
+					{
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -929,6 +951,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1041,18 +1064,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1094,7 +1122,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1102,11 +1129,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_Essence_6.2_Vanguard/dist/game/config/Rates.ini

@@ -109,6 +109,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_Essence_6.2_Vanguard/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -790,18 +790,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -809,15 +808,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -856,74 +849,103 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
-			
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					if (item.getId() == Inventory.LCOIN_ID)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
+						rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE_LCOIN, 1);
 					}
 					
-					// calculate if item will drop
-					totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-						continue;
+						totalChance += dropItem.getChance();
+					}
+					else
+					{
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -947,6 +969,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1059,18 +1082,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1112,7 +1140,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1120,11 +1147,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim

L2J_Mobius_Essence_6.3_Crusader/dist/game/config/Rates.ini

@@ -109,6 +109,7 @@ DropChanceMultiplierByItemId = 57,1
 # Maximum drop occurrences.
 # Note: Items that have 100% drop chance without server rate multipliers
 # are not counted by this value. They will drop as extra drops.
+# Also grouped drops with total chance over 100% break this configuration.
 DropMaxOccurrencesNormal = 2
 DropMaxOccurrencesRaidboss = 7
 

L2J_Mobius_Essence_6.3_Crusader/java/org/l2jmobius/gameserver/model/actor/templates/NpcTemplate.java

@@ -790,18 +790,17 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 		final double levelGapChanceToDropAdena = Util.map(levelDifference, -Config.DROP_ADENA_MAX_LEVEL_DIFFERENCE, -Config.DROP_ADENA_MIN_LEVEL_DIFFERENCE, Config.DROP_ADENA_MIN_LEVEL_GAP_CHANCE, 100d);
 		final double levelGapChanceToDrop = Util.map(levelDifference, -Config.DROP_ITEM_MAX_LEVEL_DIFFERENCE, -Config.DROP_ITEM_MIN_LEVEL_DIFFERENCE, Config.DROP_ITEM_MIN_LEVEL_GAP_CHANCE, 100d);
 		
-		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
 		List<ItemHolder> calculatedDrops = null;
+		int dropOccurrenceCounter = victim.isRaid() ? Config.DROP_MAX_OCCURRENCES_RAIDBOSS : Config.DROP_MAX_OCCURRENCES_NORMAL;
+		if (dropOccurrenceCounter > 0)
+		{
+			List<ItemHolder> randomDrops = null;
+			ItemHolder cachedItem = null;
+			double totalChance; // total group chance is 100
 			for (DropGroupHolder group : _dropGroups)
 			{
-			if (dropOccurrenceCounter <= 0)
-			{
-				break;
-			}
-			
-			double groupRate = 1;
-			final List<DropHolder> groupDrops = group.getDropList();
-			for (DropHolder dropItem : groupDrops)
+				totalChance = 0;
+				GROUP_DROP: for (DropHolder dropItem : group.getDropList())
 				{
 					final int itemId = dropItem.getItemId();
 					final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
@@ -809,15 +808,9 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					
 					// chance
 					double rateChance = 1;
-				final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
-				if (itemChance != null)
+					if (Config.RATE_DROP_CHANCE_BY_ID.get(itemId) != null)
 					{
-					if (itemChance <= 0)
-					{
-						continue;
-					}
-					
-					rateChance *= itemChance;
+						rateChance *= Config.RATE_DROP_CHANCE_BY_ID.get(itemId);
 						if (champion && (itemId == Inventory.ADENA_ID))
 						{
 							rateChance *= Config.CHAMPION_ADENAS_REWARDS_CHANCE;
@@ -856,74 +849,103 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 							rateChance *= Config.PREMIUM_RATE_DROP_CHANCE;
 						}
 					}
-				
-				// keep lowest to avoid chance by id configuration conflicts
-				groupRate = Math.min(groupRate, rateChance);
-			}
-			
 					// bonus drop rate effect
-			groupRate *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
-			
-			if ((Rnd.nextDouble() * 100) < (group.getChance() * groupRate))
+					rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE, 1);
+					if (item.getId() == Inventory.LCOIN_ID)
 					{
-				double totalChance = 0; // total group chance is 100
-				final double dropChance = Rnd.nextDouble() * 100;
-				GROUP_DROP: for (DropHolder dropItem : groupDrops)
-				{
-					if (dropOccurrenceCounter <= 0)
-					{
-						break;
+						rateChance *= killer.getStat().getMul(Stat.BONUS_DROP_RATE_LCOIN, 1);
 					}
 					
-					// calculate if item will drop
-					totalChance += dropItem.getChance();
-					if (dropChance >= totalChance)
+					// only use total chance on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
 					{
-						continue;
+						totalChance += dropItem.getChance();
+					}
+					else
+					{
+						totalChance = dropItem.getChance();
+					}
+					final double groupItemChance = totalChance * (group.getChance() / 100) * rateChance;
+					
+					// check if maximum drop occurrences have been reached
+					// items that have 100% drop chance without server rate multipliers drop normally
+					if ((dropOccurrenceCounter == 0) && (groupItemChance < 100) && (randomDrops != null) && (calculatedDrops != null))
+					{
+						if ((rateChance == 1) && !randomDrops.isEmpty()) // custom rates break this logic because total chance is more than 100%
+						{
+							// remove highest chance item (temporarily if no other item replaces it)
+							cachedItem = randomDrops.remove(0);
+							calculatedDrops.remove(cachedItem);
+						}
+						dropOccurrenceCounter = 1;
 					}
 					
 					// check level gap that may prevent to drop item
 					if ((Rnd.nextDouble() * 100) > (dropItem.getItemId() == Inventory.ADENA_ID ? levelGapChanceToDropAdena : levelGapChanceToDrop))
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// skip zero chance drops
-					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
-					if ((itemChance != null) && (itemChance <= 0))
+					// calculate chances
+					final ItemHolder drop = calculateGroupDrop(group, dropItem, victim, killer, groupItemChance);
+					if (drop == null)
 					{
-						continue;
+						continue GROUP_DROP;
 					}
 					
-					// create the drop
-					final ItemHolder drop = calculateGroupDrop(dropItem, victim, killer);
-					
-					// create list
+					// create lists
+					if (randomDrops == null)
+					{
+						randomDrops = new ArrayList<>(dropOccurrenceCounter);
+					}
 					if (calculatedDrops == null)
 					{
 						calculatedDrops = new ArrayList<>(dropOccurrenceCounter);
 					}
 					
 					// finally
+					final Float itemChance = Config.RATE_DROP_CHANCE_BY_ID.get(dropItem.getItemId());
 					if (itemChance != null)
 					{
-						if ((dropItem.getChance() * itemChance) < 100)
+						if ((groupItemChance * itemChance) < 100)
 						{
 							dropOccurrenceCounter--;
+							if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+							{
+								randomDrops.add(drop);
 							}
 						}
-					else if (dropItem.getChance() < 100)
+					}
+					else if (groupItemChance < 100)
 					{
 						dropOccurrenceCounter--;
+						if (rateChance == 1) // custom rates break this logic because total chance is more than 100%
+						{
+							randomDrops.add(drop);
+						}
 					}
 					calculatedDrops.add(drop);
 					
-					// no more drops from this group
+					// no more drops from this group, only use on x1, custom rates break this logic because total chance is more than 100%
+					if (rateChance == 1)
+					{
 						break GROUP_DROP;
 					}
 				}
 			}
 			
+			// add temporarily removed item when not replaced
+			if ((dropOccurrenceCounter > 0) && (cachedItem != null) && (calculatedDrops != null))
+			{
+				calculatedDrops.add(cachedItem);
+			}
+			// clear random drops
+			if (randomDrops != null)
+			{
+				randomDrops.clear();
+				randomDrops = null;
+			}
+			
 			// champion extra drop
 			if (victim.isChampion())
 			{
@@ -947,6 +969,7 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 					calculatedDrops.addAll(Config.CHAMPION_REWARD_ITEMS);
 				}
 			}
+		}
 		
 		return calculatedDrops;
 	}
@@ -1059,18 +1082,23 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 	}
 	
 	/**
+	 * @param group
 	 * @param dropItem
 	 * @param victim
 	 * @param killer
+	 * @param chance
 	 * @return ItemHolder
 	 */
-	private ItemHolder calculateGroupDrop(DropHolder dropItem, Creature victim, Creature killer)
+	private ItemHolder calculateGroupDrop(DropGroupHolder group, DropHolder dropItem, Creature victim, Creature killer, double chance)
 	{
 		final int itemId = dropItem.getItemId();
 		final ItemTemplate item = ItemTable.getInstance().getTemplate(itemId);
 		final boolean champion = victim.isChampion();
 		
-		// calculate amount
+		// calculate if item will drop
+		if ((Rnd.nextDouble() * 100) < chance)
+		{
+			// amount is calculated after chance returned success
 			double rateAmount = 1;
 			if (Config.RATE_DROP_AMOUNT_BY_ID.get(itemId) != null)
 			{
@@ -1112,7 +1140,6 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= Config.PREMIUM_RATE_DROP_AMOUNT;
 				}
-		}
 				
 				// bonus drop amount effect
 				rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_AMOUNT, 1);
@@ -1120,11 +1147,15 @@ public class NpcTemplate extends CreatureTemplate implements IIdentifiable
 				{
 					rateAmount *= killer.getStat().getMul(Stat.BONUS_DROP_ADENA, 1);
 				}
+			}
 			
 			// finally
 			return new ItemHolder(itemId, (long) (Rnd.get(dropItem.getMin(), dropItem.getMax()) * rateAmount));
 		}
 		
+		return null;
+	}
+	
 	/**
 	 * @param dropItem
 	 * @param victim