Return zero as nonexistent skill level.

L2J_Mobius_1.0_Ertheia/dist/game/data/scripts/handlers/skillconditionhandlers/OpSkillAcquireSkillCondition.java

@@ -44,6 +44,6 @@ public class OpSkillAcquireSkillCondition implements ISkillCondition
 			return false;
 		}
 		final int skillLevel = ((L2Character) target).getSkillLevel(_skillId);
-		return _hasLearned ? skillLevel != -1 : skillLevel == -1;
+		return _hasLearned ? skillLevel != 0 : skillLevel == 0;
 	}
 }

L2J_Mobius_1.0_Ertheia/java/com/l2jmobius/gameserver/model/actor/L2Character.java

@@ -4021,7 +4021,7 @@ public abstract class L2Character extends L2Object implements ISkillsHolder, IDe
 	public int getSkillLevel(int skillId)
 	{
 		final Skill skill = getKnownSkill(skillId);
-		return (skill == null) ? -1 : skill.getLevel();
+		return (skill == null) ? 0 : skill.getLevel();
 	}
 	
 	/**

L2J_Mobius_1.0_Ertheia/java/com/l2jmobius/gameserver/model/actor/instance/L2PcInstance.java

@@ -2605,7 +2605,7 @@ public final class L2PcInstance extends L2Playable
 				continue;
 			}
 			
-			if (getSkillLevel(skill.getId()) == -1)
+			if (getSkillLevel(skill.getId()) == 0)
 			{
 				skillCounter++;
 			}

L2J_Mobius_1.0_Ertheia/java/com/l2jmobius/gameserver/model/actor/instance/L2PetInstance.java

@@ -1255,7 +1255,7 @@ public class L2PetInstance extends L2Summon
 	{
 		if (getKnownSkill(skillId) == null)
 		{
-			return -1;
+			return 0;
 		}
 		
 		final int lvl = getLevel();

L2J_Mobius_1.0_Ertheia/java/com/l2jmobius/gameserver/model/holders/PlayerSkillHolder.java

@@ -71,7 +71,7 @@ public class PlayerSkillHolder implements ISkillsHolder
 	public int getSkillLevel(int skillId)
 	{
 		final Skill skill = getKnownSkill(skillId);
-		return (skill == null) ? -1 : skill.getLevel();
+		return (skill == null) ? 0 : skill.getLevel();
 	}
 	
 	/**

L2J_Mobius_1.0_Ertheia/java/com/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -341,7 +341,7 @@ public abstract class Inventory extends ItemContainer
 					
 					itm.getItem().forEachSkill(ItemSkillType.NORMAL, holder ->
 					{
-						if (player.getSkillLevel(holder.getSkillId()) != -1)
+						if (player.getSkillLevel(holder.getSkillId()) != 0)
 						{
 							return;
 						}

L2J_Mobius_1.0_Ertheia/java/com/l2jmobius/gameserver/network/clientpackets/RequestAcquireSkill.java

@@ -138,8 +138,7 @@ public final class RequestAcquireSkill implements IClientIncomingPacket
 				return;
 			}
 			
-			final int tmpLv = (prevSkillLevel == -1) ? 0 : prevSkillLevel;
-			if (tmpLv != (_level - 1))
+			if (prevSkillLevel != (_level - 1))
 			{
 				// The previous level skill has not been learned.
 				activeChar.sendPacket(SystemMessageId.THE_PREVIOUS_LEVEL_SKILL_HAS_NOT_BEEN_LEARNED);
@@ -759,7 +758,6 @@ public final class RequestAcquireSkill implements IClientIncomingPacket
 	}
 	
 	/**
-	 * TODO: CHECK & REMOVE THIS SHIT!!!!!!!!!!!!!!<br>
 	 * Verify if the player can transform.
 	 * @param player the player to verify
 	 * @return {@code true} if the player meets the required conditions to learn a transformation, {@code false} otherwise
@@ -770,7 +768,7 @@ public final class RequestAcquireSkill implements IClientIncomingPacket
 		{
 			return true;
 		}
-		final QuestState st = player.getQuestState("Q00136_MoreThanMeetsTheEye");
-		return (st != null) && st.isCompleted();
+		final QuestState qs = player.getQuestState("Q00136_MoreThanMeetsTheEye");
+		return (qs != null) && qs.isCompleted();
 	}
 }

L2J_Mobius_1.0_Ertheia/java/com/l2jmobius/gameserver/network/clientpackets/RequestAcquireSkillInfo.java

@@ -90,7 +90,7 @@ public final class RequestAcquireSkillInfo implements IClientIncomingPacket
 		{
 			if (prevSkillLevel == _level)
 			{
-				_log.warning(RequestAcquireSkillInfo.class.getSimpleName() + ": Player " + activeChar.getName() + " is trequesting info for a skill that already knows, Id: " + _id + " level: " + _level + "!");
+				_log.warning(RequestAcquireSkillInfo.class.getSimpleName() + ": Player " + activeChar.getName() + " is requesting info for a skill that already knows, Id: " + _id + " level: " + _level + "!");
 			}
 			else if (prevSkillLevel != (_level - 1))
 			{

L2J_Mobius_1.0_Ertheia/java/com/l2jmobius/gameserver/network/clientpackets/ability/RequestAcquireAbilityList.java

@@ -144,7 +144,7 @@ public class RequestAcquireAbilityList implements IClientIncomingPacket
 			final Skill skill = SkillData.getInstance().getSkill(learn.getSkillId(), learn.getSkillLevel());
 			final int points;
 			final int knownLevel = activeChar.getSkillLevel(skill.getId());
-			if (knownLevel == -1) // player didn't knew it at all!
+			if (knownLevel == 0) // player didn't knew it at all!
 			{
 				points = learn.getSkillLevel();
 			}

L2J_Mobius_2.5_Underground/dist/game/data/scripts/handlers/skillconditionhandlers/OpSkillAcquireSkillCondition.java

@@ -44,6 +44,6 @@ public class OpSkillAcquireSkillCondition implements ISkillCondition
 			return false;
 		}
 		final int skillLevel = ((L2Character) target).getSkillLevel(_skillId);
-		return _hasLearned ? skillLevel != -1 : skillLevel == -1;
+		return _hasLearned ? skillLevel != 0 : skillLevel == 0;
 	}
 }

L2J_Mobius_2.5_Underground/java/com/l2jmobius/gameserver/model/actor/L2Character.java

@@ -4021,7 +4021,7 @@ public abstract class L2Character extends L2Object implements ISkillsHolder, IDe
 	public int getSkillLevel(int skillId)
 	{
 		final Skill skill = getKnownSkill(skillId);
-		return (skill == null) ? -1 : skill.getLevel();
+		return (skill == null) ? 0 : skill.getLevel();
 	}
 	
 	/**

L2J_Mobius_2.5_Underground/java/com/l2jmobius/gameserver/model/actor/instance/L2PcInstance.java

@@ -2611,7 +2611,7 @@ public final class L2PcInstance extends L2Playable
 				continue;
 			}
 			
-			if (getSkillLevel(skill.getId()) == -1)
+			if (getSkillLevel(skill.getId()) == 0)
 			{
 				skillCounter++;
 			}

L2J_Mobius_2.5_Underground/java/com/l2jmobius/gameserver/model/actor/instance/L2PetInstance.java

@@ -1255,7 +1255,7 @@ public class L2PetInstance extends L2Summon
 	{
 		if (getKnownSkill(skillId) == null)
 		{
-			return -1;
+			return 0;
 		}
 		
 		final int lvl = getLevel();

L2J_Mobius_2.5_Underground/java/com/l2jmobius/gameserver/model/holders/PlayerSkillHolder.java

@@ -71,7 +71,7 @@ public class PlayerSkillHolder implements ISkillsHolder
 	public int getSkillLevel(int skillId)
 	{
 		final Skill skill = getKnownSkill(skillId);
-		return (skill == null) ? -1 : skill.getLevel();
+		return (skill == null) ? 0 : skill.getLevel();
 	}
 	
 	/**

L2J_Mobius_2.5_Underground/java/com/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -344,7 +344,7 @@ public abstract class Inventory extends ItemContainer
 					
 					itm.getItem().forEachSkill(ItemSkillType.NORMAL, holder ->
 					{
-						if (player.getSkillLevel(holder.getSkillId()) != -1)
+						if (player.getSkillLevel(holder.getSkillId()) != 0)
 						{
 							return;
 						}

L2J_Mobius_2.5_Underground/java/com/l2jmobius/gameserver/network/clientpackets/RequestAcquireSkill.java

@@ -138,8 +138,7 @@ public final class RequestAcquireSkill implements IClientIncomingPacket
 				return;
 			}
 			
-			final int tmpLv = (prevSkillLevel == -1) ? 0 : prevSkillLevel;
-			if (tmpLv != (_level - 1))
+			if (prevSkillLevel != (_level - 1))
 			{
 				// The previous level skill has not been learned.
 				activeChar.sendPacket(SystemMessageId.THE_PREVIOUS_LEVEL_SKILL_HAS_NOT_BEEN_LEARNED);
@@ -759,7 +758,6 @@ public final class RequestAcquireSkill implements IClientIncomingPacket
 	}
 	
 	/**
-	 * TODO: CHECK & REMOVE THIS SHIT!!!!!!!!!!!!!!<br>
 	 * Verify if the player can transform.
 	 * @param player the player to verify
 	 * @return {@code true} if the player meets the required conditions to learn a transformation, {@code false} otherwise
@@ -770,7 +768,7 @@ public final class RequestAcquireSkill implements IClientIncomingPacket
 		{
 			return true;
 		}
-		final QuestState st = player.getQuestState("Q00136_MoreThanMeetsTheEye");
-		return (st != null) && st.isCompleted();
+		final QuestState qs = player.getQuestState("Q00136_MoreThanMeetsTheEye");
+		return (qs != null) && qs.isCompleted();
 	}
 }

L2J_Mobius_2.5_Underground/java/com/l2jmobius/gameserver/network/clientpackets/RequestAcquireSkillInfo.java

@@ -90,7 +90,7 @@ public final class RequestAcquireSkillInfo implements IClientIncomingPacket
 		{
 			if (prevSkillLevel == _level)
 			{
-				_log.warning(RequestAcquireSkillInfo.class.getSimpleName() + ": Player " + activeChar.getName() + " is trequesting info for a skill that already knows, Id: " + _id + " level: " + _level + "!");
+				_log.warning(RequestAcquireSkillInfo.class.getSimpleName() + ": Player " + activeChar.getName() + " is requesting info for a skill that already knows, Id: " + _id + " level: " + _level + "!");
 			}
 			else if (prevSkillLevel != (_level - 1))
 			{

L2J_Mobius_2.5_Underground/java/com/l2jmobius/gameserver/network/clientpackets/ability/RequestAcquireAbilityList.java

@@ -144,7 +144,7 @@ public class RequestAcquireAbilityList implements IClientIncomingPacket
 			final Skill skill = SkillData.getInstance().getSkill(learn.getSkillId(), learn.getSkillLevel());
 			final int points;
 			final int knownLevel = activeChar.getSkillLevel(skill.getId());
-			if (knownLevel == -1) // player didn't knew it at all!
+			if (knownLevel == 0) // player didn't knew it at all!
 			{
 				points = learn.getSkillLevel();
 			}

L2J_Mobius_3.0_Helios/dist/game/data/scripts/handlers/skillconditionhandlers/OpSkillAcquireSkillCondition.java

@@ -44,6 +44,6 @@ public class OpSkillAcquireSkillCondition implements ISkillCondition
 			return false;
 		}
 		final int skillLevel = ((L2Character) target).getSkillLevel(_skillId);
-		return _hasLearned ? skillLevel != -1 : skillLevel == -1;
+		return _hasLearned ? skillLevel != 0 : skillLevel == 0;
 	}
 }

L2J_Mobius_3.0_Helios/java/com/l2jmobius/gameserver/model/actor/L2Character.java

@@ -4021,7 +4021,7 @@ public abstract class L2Character extends L2Object implements ISkillsHolder, IDe
 	public int getSkillLevel(int skillId)
 	{
 		final Skill skill = getKnownSkill(skillId);
-		return (skill == null) ? -1 : skill.getLevel();
+		return (skill == null) ? 0 : skill.getLevel();
 	}
 	
 	/**

L2J_Mobius_3.0_Helios/java/com/l2jmobius/gameserver/model/actor/instance/L2PcInstance.java

@@ -2613,7 +2613,7 @@ public final class L2PcInstance extends L2Playable
 				continue;
 			}
 			
-			if (getSkillLevel(skill.getId()) == -1)
+			if (getSkillLevel(skill.getId()) == 0)
 			{
 				skillCounter++;
 			}

L2J_Mobius_3.0_Helios/java/com/l2jmobius/gameserver/model/actor/instance/L2PetInstance.java

@@ -1255,7 +1255,7 @@ public class L2PetInstance extends L2Summon
 	{
 		if (getKnownSkill(skillId) == null)
 		{
-			return -1;
+			return 0;
 		}
 		
 		final int lvl = getLevel();

L2J_Mobius_3.0_Helios/java/com/l2jmobius/gameserver/model/holders/PlayerSkillHolder.java

@@ -71,7 +71,7 @@ public class PlayerSkillHolder implements ISkillsHolder
 	public int getSkillLevel(int skillId)
 	{
 		final Skill skill = getKnownSkill(skillId);
-		return (skill == null) ? -1 : skill.getLevel();
+		return (skill == null) ? 0 : skill.getLevel();
 	}
 	
 	/**

L2J_Mobius_3.0_Helios/java/com/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -344,7 +344,7 @@ public abstract class Inventory extends ItemContainer
 					
 					itm.getItem().forEachSkill(ItemSkillType.NORMAL, holder ->
 					{
-						if (player.getSkillLevel(holder.getSkillId()) != -1)
+						if (player.getSkillLevel(holder.getSkillId()) != 0)
 						{
 							return;
 						}

L2J_Mobius_3.0_Helios/java/com/l2jmobius/gameserver/network/clientpackets/RequestAcquireSkill.java

@@ -138,8 +138,7 @@ public final class RequestAcquireSkill implements IClientIncomingPacket
 				return;
 			}
 			
-			final int tmpLv = (prevSkillLevel == -1) ? 0 : prevSkillLevel;
-			if (tmpLv != (_level - 1))
+			if (prevSkillLevel != (_level - 1))
 			{
 				// The previous level skill has not been learned.
 				activeChar.sendPacket(SystemMessageId.THE_PREVIOUS_LEVEL_SKILL_HAS_NOT_BEEN_LEARNED);
@@ -759,7 +758,6 @@ public final class RequestAcquireSkill implements IClientIncomingPacket
 	}
 	
 	/**
-	 * TODO: CHECK & REMOVE THIS SHIT!!!!!!!!!!!!!!<br>
 	 * Verify if the player can transform.
 	 * @param player the player to verify
 	 * @return {@code true} if the player meets the required conditions to learn a transformation, {@code false} otherwise
@@ -770,7 +768,7 @@ public final class RequestAcquireSkill implements IClientIncomingPacket
 		{
 			return true;
 		}
-		final QuestState st = player.getQuestState("Q00136_MoreThanMeetsTheEye");
-		return (st != null) && st.isCompleted();
+		final QuestState qs = player.getQuestState("Q00136_MoreThanMeetsTheEye");
+		return (qs != null) && qs.isCompleted();
 	}
 }

L2J_Mobius_3.0_Helios/java/com/l2jmobius/gameserver/network/clientpackets/RequestAcquireSkillInfo.java

@@ -90,7 +90,7 @@ public final class RequestAcquireSkillInfo implements IClientIncomingPacket
 		{
 			if (prevSkillLevel == _level)
 			{
-				_log.warning(RequestAcquireSkillInfo.class.getSimpleName() + ": Player " + activeChar.getName() + " is trequesting info for a skill that already knows, Id: " + _id + " level: " + _level + "!");
+				_log.warning(RequestAcquireSkillInfo.class.getSimpleName() + ": Player " + activeChar.getName() + " is requesting info for a skill that already knows, Id: " + _id + " level: " + _level + "!");
 			}
 			else if (prevSkillLevel != (_level - 1))
 			{

L2J_Mobius_3.0_Helios/java/com/l2jmobius/gameserver/network/clientpackets/ability/RequestAcquireAbilityList.java

@@ -144,7 +144,7 @@ public class RequestAcquireAbilityList implements IClientIncomingPacket
 			final Skill skill = SkillData.getInstance().getSkill(learn.getSkillId(), learn.getSkillLevel());
 			final int points;
 			final int knownLevel = activeChar.getSkillLevel(skill.getId());
-			if (knownLevel == -1) // player didn't knew it at all!
+			if (knownLevel == 0) // player didn't knew it at all!
 			{
 				points = learn.getSkillLevel();
 			}

L2J_Mobius_4.0_GrandCrusade/dist/game/data/scripts/handlers/skillconditionhandlers/OpSkillAcquireSkillCondition.java

@@ -44,6 +44,6 @@ public class OpSkillAcquireSkillCondition implements ISkillCondition
 			return false;
 		}
 		final int skillLevel = ((L2Character) target).getSkillLevel(_skillId);
-		return _hasLearned ? skillLevel != -1 : skillLevel == -1;
+		return _hasLearned ? skillLevel != 0 : skillLevel == 0;
 	}
 }

L2J_Mobius_4.0_GrandCrusade/java/com/l2jmobius/gameserver/model/actor/L2Character.java

@@ -4021,7 +4021,7 @@ public abstract class L2Character extends L2Object implements ISkillsHolder, IDe
 	public int getSkillLevel(int skillId)
 	{
 		final Skill skill = getKnownSkill(skillId);
-		return (skill == null) ? -1 : skill.getLevel();
+		return (skill == null) ? 0 : skill.getLevel();
 	}
 	
 	/**

L2J_Mobius_4.0_GrandCrusade/java/com/l2jmobius/gameserver/model/actor/instance/L2PcInstance.java

@@ -2616,7 +2616,7 @@ public final class L2PcInstance extends L2Playable
 				continue;
 			}
 			
-			if (getSkillLevel(skill.getId()) == -1)
+			if (getSkillLevel(skill.getId()) == 0)
 			{
 				skillCounter++;
 			}

L2J_Mobius_4.0_GrandCrusade/java/com/l2jmobius/gameserver/model/actor/instance/L2PetInstance.java

@@ -1255,7 +1255,7 @@ public class L2PetInstance extends L2Summon
 	{
 		if (getKnownSkill(skillId) == null)
 		{
-			return -1;
+			return 0;
 		}
 		
 		final int lvl = getLevel();

L2J_Mobius_4.0_GrandCrusade/java/com/l2jmobius/gameserver/model/holders/PlayerSkillHolder.java

@@ -71,7 +71,7 @@ public class PlayerSkillHolder implements ISkillsHolder
 	public int getSkillLevel(int skillId)
 	{
 		final Skill skill = getKnownSkill(skillId);
-		return (skill == null) ? -1 : skill.getLevel();
+		return (skill == null) ? 0 : skill.getLevel();
 	}
 	
 	/**

L2J_Mobius_4.0_GrandCrusade/java/com/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -344,7 +344,7 @@ public abstract class Inventory extends ItemContainer
 					
 					itm.getItem().forEachSkill(ItemSkillType.NORMAL, holder ->
 					{
-						if (player.getSkillLevel(holder.getSkillId()) != -1)
+						if (player.getSkillLevel(holder.getSkillId()) != 0)
 						{
 							return;
 						}

L2J_Mobius_4.0_GrandCrusade/java/com/l2jmobius/gameserver/network/clientpackets/RequestAcquireSkill.java

@@ -138,8 +138,7 @@ public final class RequestAcquireSkill implements IClientIncomingPacket
 				return;
 			}
 			
-			final int tmpLv = (prevSkillLevel == -1) ? 0 : prevSkillLevel;
-			if (tmpLv != (_level - 1))
+			if (prevSkillLevel != (_level - 1))
 			{
 				// The previous level skill has not been learned.
 				activeChar.sendPacket(SystemMessageId.THE_PREVIOUS_LEVEL_SKILL_HAS_NOT_BEEN_LEARNED);
@@ -759,7 +758,6 @@ public final class RequestAcquireSkill implements IClientIncomingPacket
 	}
 	
 	/**
-	 * TODO: CHECK & REMOVE THIS SHIT!!!!!!!!!!!!!!<br>
 	 * Verify if the player can transform.
 	 * @param player the player to verify
 	 * @return {@code true} if the player meets the required conditions to learn a transformation, {@code false} otherwise
@@ -770,7 +768,7 @@ public final class RequestAcquireSkill implements IClientIncomingPacket
 		{
 			return true;
 		}
-		final QuestState st = player.getQuestState("Q00136_MoreThanMeetsTheEye");
-		return (st != null) && st.isCompleted();
+		final QuestState qs = player.getQuestState("Q00136_MoreThanMeetsTheEye");
+		return (qs != null) && qs.isCompleted();
 	}
 }

L2J_Mobius_4.0_GrandCrusade/java/com/l2jmobius/gameserver/network/clientpackets/RequestAcquireSkillInfo.java

@@ -90,7 +90,7 @@ public final class RequestAcquireSkillInfo implements IClientIncomingPacket
 		{
 			if (prevSkillLevel == _level)
 			{
-				_log.warning(RequestAcquireSkillInfo.class.getSimpleName() + ": Player " + activeChar.getName() + " is trequesting info for a skill that already knows, Id: " + _id + " level: " + _level + "!");
+				_log.warning(RequestAcquireSkillInfo.class.getSimpleName() + ": Player " + activeChar.getName() + " is requesting info for a skill that already knows, Id: " + _id + " level: " + _level + "!");
 			}
 			else if (prevSkillLevel != (_level - 1))
 			{

L2J_Mobius_4.0_GrandCrusade/java/com/l2jmobius/gameserver/network/clientpackets/ability/RequestAcquireAbilityList.java

@@ -144,7 +144,7 @@ public class RequestAcquireAbilityList implements IClientIncomingPacket
 			final Skill skill = SkillData.getInstance().getSkill(learn.getSkillId(), learn.getSkillLevel());
 			final int points;
 			final int knownLevel = activeChar.getSkillLevel(skill.getId());
-			if (knownLevel == -1) // player didn't knew it at all!
+			if (knownLevel == 0) // player didn't knew it at all!
 			{
 				points = learn.getSkillLevel();
 			}

L2J_Mobius_C6_Interlude/java/com/l2jmobius/gameserver/handler/admincommandhandlers/AdminSkill.java

@@ -224,7 +224,7 @@ public class AdminSkill implements IAdminCommandHandler
 					continue;
 				}
 				
-				if (player.getSkillLevel(sk.getId()) == -1)
+				if (player.getSkillLevel(sk.getId()) == 0)
 				{
 					skillCounter++;
 				}

L2J_Mobius_C6_Interlude/java/com/l2jmobius/gameserver/model/actor/L2Character.java

@@ -8104,13 +8104,7 @@ public abstract class L2Character extends L2Object implements ISkillsHolder
 	public int getSkillLevel(int skillId)
 	{
 		final L2Skill skill = getSkills().get(skillId);
-		
-		if (skill == null)
-		{
-			return -1;
-		}
-		
-		return skill.getLevel();
+		return (skill == null) ? 0 : skill.getLevel();
 	}
 	
 	/**
@@ -8194,7 +8188,7 @@ public abstract class L2Character extends L2Object implements ISkillsHolder
 	 */
 	public int getMaxBuffCount()
 	{
-		return Config.BUFFS_MAX_AMOUNT + Math.max(0, getSkillLevel(L2Skill.SKILL_DIVINE_INSPIRATION));
+		return Config.BUFFS_MAX_AMOUNT + getSkillLevel(L2Skill.SKILL_DIVINE_INSPIRATION);
 	}
 	
 	/**
@@ -8496,12 +8490,7 @@ public abstract class L2Character extends L2Object implements ISkillsHolder
 		final int magicId = skill.getDisplayId();
 		
 		// Get the level of the skill
-		int level = getSkillLevel(skill.getId());
-		
-		if (level < 1)
-		{
-			level = 1;
-		}
+		final int level = getSkillLevel(skill.getId());
 		
 		// Send a Server->Client packet MagicSkillLaunched to the L2Character AND to all L2PcInstance in the _KnownPlayers of the L2Character
 		if (!skill.isPotion())

L2J_Mobius_C6_Interlude/java/com/l2jmobius/gameserver/model/actor/instance/L2PcInstance.java

@@ -3893,7 +3893,7 @@ public final class L2PcInstance extends L2Playable
 			// continue;
 			// }
 			
-			if (getSkillLevel(sk.getId()) == -1)
+			if (getSkillLevel(sk.getId()) == 0)
 			{
 				skillCounter++;
 			}
@@ -7533,7 +7533,7 @@ public final class L2PcInstance extends L2Playable
 					{
 						// Reduce the Experience of the L2PcInstance in function of the calculated Death Penalty
 						// NOTE: deathPenalty +- Exp will update karma
-						if ((getSkillLevel(L2Skill.SKILL_LUCKY) < 0) || (getStat().getLevel() > 9))
+						if ((getSkillLevel(L2Skill.SKILL_LUCKY) <= 0) || (getStat().getLevel() > 9))
 						{
 							deathPenalty(((pk != null) && (getClan() != null) && (pk.getClan() != null) && pk.getClan().isAtWarWith(getClanId())));
 						}

L2J_Mobius_C6_Interlude/java/com/l2jmobius/gameserver/model/actor/instance/L2PetInstance.java

@@ -1342,7 +1342,7 @@ public class L2PetInstance extends L2Summon
 	{
 		if ((getSkills() == null) || (getSkills().get(skillId) == null))
 		{
-			return -1;
+			return 0;
 		}
 		final int lvl = getLevel();
 		return lvl > 70 ? 7 + ((lvl - 70) / 5) : lvl / 10;

L2J_Mobius_C6_Interlude/java/com/l2jmobius/gameserver/skills/holders/PlayerSkillHolder.java

@@ -61,7 +61,7 @@ public class PlayerSkillHolder implements ISkillsHolder
 	public int getSkillLevel(int skillId)
 	{
 		final L2Skill skill = getKnownSkill(skillId);
-		return (skill == null) ? -1 : skill.getLevel();
+		return (skill == null) ? 0 : skill.getLevel();
 	}
 	
 	/**

L2J_Mobius_C6_Interlude/java/com/l2jmobius/gameserver/skills/l2skills/L2SkillSummon.java

@@ -87,10 +87,6 @@ public class L2SkillSummon extends L2Skill
 					return true; // Player is always able to cast mass cubic skill
 				}
 				int mastery = player.getSkillLevel(SKILL_CUBIC_MASTERY);
-				if (mastery < 0)
-				{
-					mastery = 0;
-				}
 				final int count = player.getCubics().size();
 				if (count > mastery)
 				{
@@ -160,10 +156,6 @@ public class L2SkillSummon extends L2Skill
 					}
 					final L2PcInstance player = ((L2PcInstance) obj);
 					int mastery = player.getSkillLevel(SKILL_CUBIC_MASTERY);
-					if (mastery < 0)
-					{
-						mastery = 0;
-					}
 					if ((mastery == 0) && !player.getCubics().isEmpty())
 					{
 						// Player can have only 1 cubic - we shuld replace old cubic with new one
@@ -196,10 +188,6 @@ public class L2SkillSummon extends L2Skill
 			}
 			
 			int mastery = activeChar.getSkillLevel(SKILL_CUBIC_MASTERY);
-			if (mastery < 0)
-			{
-				mastery = 0;
-			}
 			if (activeChar.getCubics().containsKey(_npcId))
 			{
 				final L2CubicInstance cubic = activeChar.getCubic(_npcId);

L2J_Mobius_CT_2.6_HighFive/java/com/l2jmobius/gameserver/model/actor/L2Character.java

@@ -5257,7 +5257,7 @@ public abstract class L2Character extends L2Object implements ISkillsHolder, IDe
 	public int getSkillLevel(int skillId)
 	{
 		final Skill skill = getKnownSkill(skillId);
-		return (skill == null) ? -1 : skill.getLevel();
+		return (skill == null) ? 0 : skill.getLevel();
 	}
 	
 	/**

L2J_Mobius_CT_2.6_HighFive/java/com/l2jmobius/gameserver/model/actor/instance/L2PcInstance.java

@@ -2592,7 +2592,7 @@ public final class L2PcInstance extends L2Playable
 				continue;
 			}
 			
-			if (getSkillLevel(sk.getId()) == -1)
+			if (getSkillLevel(sk.getId()) == 0)
 			{
 				skillCounter++;
 			}
@@ -10631,7 +10631,7 @@ public final class L2PcInstance extends L2Playable
 	 */
 	public int getExpertiseLevel()
 	{
-		return getSkillLevel(239) < 0 ? 0 : getSkillLevel(239);
+		return getSkillLevel(239);
 	}
 	
 	@Override

L2J_Mobius_CT_2.6_HighFive/java/com/l2jmobius/gameserver/model/actor/instance/L2PetInstance.java

@@ -1200,7 +1200,7 @@ public class L2PetInstance extends L2Summon
 	{
 		if (getKnownSkill(skillId) == null)
 		{
-			return -1;
+			return 0;
 		}
 		
 		final int lvl = getLevel();

L2J_Mobius_CT_2.6_HighFive/java/com/l2jmobius/gameserver/model/actor/stat/CharStat.java

@@ -813,8 +813,7 @@ public class CharStat
 	 */
 	public int getMaxBuffCount()
 	{
-		final int extraSlots = _activeChar.getSkillLevel(DIVINE_INSPIRATION);
-		return extraSlots > -1 ? _maxBuffCount + extraSlots : _maxBuffCount;
+		return _maxBuffCount + _activeChar.getSkillLevel(DIVINE_INSPIRATION);
 	}
 	
 	/**

L2J_Mobius_CT_2.6_HighFive/java/com/l2jmobius/gameserver/model/holders/PlayerSkillHolder.java

@@ -71,7 +71,7 @@ public class PlayerSkillHolder implements ISkillsHolder
 	public int getSkillLevel(int skillId)
 	{
 		final Skill skill = getKnownSkill(skillId);
-		return (skill == null) ? -1 : skill.getLevel();
+		return (skill == null) ? 0 : skill.getLevel();
 	}
 	
 	/**

L2J_Mobius_CT_2.6_HighFive/java/com/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -337,7 +337,7 @@ public abstract class Inventory extends ItemContainer
 					}
 					for (SkillHolder sk : itm.getItem().getSkills())
 					{
-						if (player.getSkillLevel(sk.getSkillId()) != -1)
+						if (player.getSkillLevel(sk.getSkillId()) != 0)
 						{
 							continue;
 						}

L2J_Mobius_CT_2.6_HighFive/java/com/l2jmobius/gameserver/network/clientpackets/RequestAcquireSkillInfo.java

@@ -84,7 +84,7 @@ public final class RequestAcquireSkillInfo extends L2GameClientPacket
 		{
 			if (prevSkillLevel == _level)
 			{
-				_log.warning(RequestAcquireSkillInfo.class.getSimpleName() + ": Player " + activeChar.getName() + " is trequesting info for a skill that already knows, Id: " + _id + " level: " + _level + "!");
+				_log.warning(RequestAcquireSkillInfo.class.getSimpleName() + ": Player " + activeChar.getName() + " is requesting info for a skill that already knows, Id: " + _id + " level: " + _level + "!");
 			}
 			else if (prevSkillLevel != (_level - 1))
 			{

L2J_Mobius_CT_2.6_HighFive/java/com/l2jmobius/gameserver/network/clientpackets/RequestExEnchantSkillInfoDetail.java

@@ -72,7 +72,7 @@ public final class RequestExEnchantSkillInfoDetail extends L2GameClientPacket
 		final int playerSkillLvl = activeChar.getSkillLevel(_skillId);
 		
 		// dont have such skill
-		if (playerSkillLvl == -1)
+		if (playerSkillLvl == 0)
 		{
 			return;
 		}

L2J_Mobius_Classic_2.0_Saviors/dist/game/data/scripts/handlers/skillconditionhandlers/OpSkillAcquireSkillCondition.java

@@ -44,6 +44,6 @@ public class OpSkillAcquireSkillCondition implements ISkillCondition
 			return false;
 		}
 		final int skillLevel = ((L2Character) target).getSkillLevel(_skillId);
-		return _hasLearned ? skillLevel != -1 : skillLevel == -1;
+		return _hasLearned ? skillLevel != 0 : skillLevel == 0;
 	}
 }

L2J_Mobius_Classic_2.0_Saviors/java/com/l2jmobius/gameserver/model/actor/L2Character.java

@@ -4021,7 +4021,7 @@ public abstract class L2Character extends L2Object implements ISkillsHolder, IDe
 	public int getSkillLevel(int skillId)
 	{
 		final Skill skill = getKnownSkill(skillId);
-		return (skill == null) ? -1 : skill.getLevel();
+		return (skill == null) ? 0 : skill.getLevel();
 	}
 	
 	/**

L2J_Mobius_Classic_2.0_Saviors/java/com/l2jmobius/gameserver/model/actor/instance/L2PcInstance.java

@@ -2587,7 +2587,7 @@ public final class L2PcInstance extends L2Playable
 				continue;
 			}
 			
-			if (getSkillLevel(skill.getId()) == -1)
+			if (getSkillLevel(skill.getId()) == 0)
 			{
 				skillCounter++;
 			}

L2J_Mobius_Classic_2.0_Saviors/java/com/l2jmobius/gameserver/model/actor/instance/L2PetInstance.java

@@ -1255,7 +1255,7 @@ public class L2PetInstance extends L2Summon
 	{
 		if (getKnownSkill(skillId) == null)
 		{
-			return -1;
+			return 0;
 		}
 		
 		final int lvl = getLevel();

L2J_Mobius_Classic_2.0_Saviors/java/com/l2jmobius/gameserver/model/holders/PlayerSkillHolder.java

@@ -71,7 +71,7 @@ public class PlayerSkillHolder implements ISkillsHolder
 	public int getSkillLevel(int skillId)
 	{
 		final Skill skill = getKnownSkill(skillId);
-		return (skill == null) ? -1 : skill.getLevel();
+		return (skill == null) ? 0 : skill.getLevel();
 	}
 	
 	/**

L2J_Mobius_Classic_2.0_Saviors/java/com/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -344,7 +344,7 @@ public abstract class Inventory extends ItemContainer
 					
 					itm.getItem().forEachSkill(ItemSkillType.NORMAL, holder ->
 					{
-						if (player.getSkillLevel(holder.getSkillId()) != -1)
+						if (player.getSkillLevel(holder.getSkillId()) != 0)
 						{
 							return;
 						}

L2J_Mobius_Classic_2.0_Saviors/java/com/l2jmobius/gameserver/network/clientpackets/RequestAcquireSkill.java

@@ -138,8 +138,7 @@ public final class RequestAcquireSkill implements IClientIncomingPacket
 				return;
 			}
 			
-			final int tmpLv = (prevSkillLevel == -1) ? 0 : prevSkillLevel;
-			if (tmpLv != (_level - 1))
+			if (prevSkillLevel != (_level - 1))
 			{
 				// The previous level skill has not been learned.
 				activeChar.sendPacket(SystemMessageId.THE_PREVIOUS_LEVEL_SKILL_HAS_NOT_BEEN_LEARNED);
@@ -759,7 +758,6 @@ public final class RequestAcquireSkill implements IClientIncomingPacket
 	}
 	
 	/**
-	 * TODO: CHECK & REMOVE THIS SHIT!!!!!!!!!!!!!!<br>
 	 * Verify if the player can transform.
 	 * @param player the player to verify
 	 * @return {@code true} if the player meets the required conditions to learn a transformation, {@code false} otherwise
@@ -770,7 +768,7 @@ public final class RequestAcquireSkill implements IClientIncomingPacket
 		{
 			return true;
 		}
-		final QuestState st = player.getQuestState("Q00136_MoreThanMeetsTheEye");
-		return (st != null) && st.isCompleted();
+		final QuestState qs = player.getQuestState("Q00136_MoreThanMeetsTheEye");
+		return (qs != null) && qs.isCompleted();
 	}
 }

L2J_Mobius_Classic_2.0_Saviors/java/com/l2jmobius/gameserver/network/clientpackets/RequestAcquireSkillInfo.java

@@ -90,7 +90,7 @@ public final class RequestAcquireSkillInfo implements IClientIncomingPacket
 		{
 			if (prevSkillLevel == _level)
 			{
-				_log.warning(RequestAcquireSkillInfo.class.getSimpleName() + ": Player " + activeChar.getName() + " is trequesting info for a skill that already knows, Id: " + _id + " level: " + _level + "!");
+				_log.warning(RequestAcquireSkillInfo.class.getSimpleName() + ": Player " + activeChar.getName() + " is requesting info for a skill that already knows, Id: " + _id + " level: " + _level + "!");
 			}
 			else if (prevSkillLevel != (_level - 1))
 			{

L2J_Mobius_Classic_2.0_Zaken/dist/game/data/scripts/handlers/skillconditionhandlers/OpSkillAcquireSkillCondition.java

@@ -44,6 +44,6 @@ public class OpSkillAcquireSkillCondition implements ISkillCondition
 			return false;
 		}
 		final int skillLevel = ((L2Character) target).getSkillLevel(_skillId);
-		return _hasLearned ? skillLevel != -1 : skillLevel == -1;
+		return _hasLearned ? skillLevel != 0 : skillLevel == 0;
 	}
 }

L2J_Mobius_Classic_2.0_Zaken/java/com/l2jmobius/gameserver/model/actor/L2Character.java

@@ -4021,7 +4021,7 @@ public abstract class L2Character extends L2Object implements ISkillsHolder, IDe
 	public int getSkillLevel(int skillId)
 	{
 		final Skill skill = getKnownSkill(skillId);
-		return (skill == null) ? -1 : skill.getLevel();
+		return (skill == null) ? 0 : skill.getLevel();
 	}
 	
 	/**

L2J_Mobius_Classic_2.0_Zaken/java/com/l2jmobius/gameserver/model/actor/instance/L2PcInstance.java

@@ -2587,7 +2587,7 @@ public final class L2PcInstance extends L2Playable
 				continue;
 			}
 			
-			if (getSkillLevel(skill.getId()) == -1)
+			if (getSkillLevel(skill.getId()) == 0)
 			{
 				skillCounter++;
 			}

L2J_Mobius_Classic_2.0_Zaken/java/com/l2jmobius/gameserver/model/actor/instance/L2PetInstance.java

@@ -1255,7 +1255,7 @@ public class L2PetInstance extends L2Summon
 	{
 		if (getKnownSkill(skillId) == null)
 		{
-			return -1;
+			return 0;
 		}
 		
 		final int lvl = getLevel();

L2J_Mobius_Classic_2.0_Zaken/java/com/l2jmobius/gameserver/model/holders/PlayerSkillHolder.java

@@ -71,7 +71,7 @@ public class PlayerSkillHolder implements ISkillsHolder
 	public int getSkillLevel(int skillId)
 	{
 		final Skill skill = getKnownSkill(skillId);
-		return (skill == null) ? -1 : skill.getLevel();
+		return (skill == null) ? 0 : skill.getLevel();
 	}
 	
 	/**

L2J_Mobius_Classic_2.0_Zaken/java/com/l2jmobius/gameserver/model/itemcontainer/Inventory.java

@@ -344,7 +344,7 @@ public abstract class Inventory extends ItemContainer
 					
 					itm.getItem().forEachSkill(ItemSkillType.NORMAL, holder ->
 					{
-						if (player.getSkillLevel(holder.getSkillId()) != -1)
+						if (player.getSkillLevel(holder.getSkillId()) != 0)
 						{
 							return;
 						}

L2J_Mobius_Classic_2.0_Zaken/java/com/l2jmobius/gameserver/network/clientpackets/RequestAcquireSkill.java

@@ -138,8 +138,7 @@ public final class RequestAcquireSkill implements IClientIncomingPacket
 				return;
 			}
 			
-			final int tmpLv = (prevSkillLevel == -1) ? 0 : prevSkillLevel;
-			if (tmpLv != (_level - 1))
+			if (prevSkillLevel != (_level - 1))
 			{
 				// The previous level skill has not been learned.
 				activeChar.sendPacket(SystemMessageId.THE_PREVIOUS_LEVEL_SKILL_HAS_NOT_BEEN_LEARNED);
@@ -759,7 +758,6 @@ public final class RequestAcquireSkill implements IClientIncomingPacket
 	}
 	
 	/**
-	 * TODO: CHECK & REMOVE THIS SHIT!!!!!!!!!!!!!!<br>
 	 * Verify if the player can transform.
 	 * @param player the player to verify
 	 * @return {@code true} if the player meets the required conditions to learn a transformation, {@code false} otherwise
@@ -770,7 +768,7 @@ public final class RequestAcquireSkill implements IClientIncomingPacket
 		{
 			return true;
 		}
-		final QuestState st = player.getQuestState("Q00136_MoreThanMeetsTheEye");
-		return (st != null) && st.isCompleted();
+		final QuestState qs = player.getQuestState("Q00136_MoreThanMeetsTheEye");
+		return (qs != null) && qs.isCompleted();
 	}
 }

L2J_Mobius_Classic_2.0_Zaken/java/com/l2jmobius/gameserver/network/clientpackets/RequestAcquireSkillInfo.java

@@ -90,7 +90,7 @@ public final class RequestAcquireSkillInfo implements IClientIncomingPacket
 		{
 			if (prevSkillLevel == _level)
 			{
-				_log.warning(RequestAcquireSkillInfo.class.getSimpleName() + ": Player " + activeChar.getName() + " is trequesting info for a skill that already knows, Id: " + _id + " level: " + _level + "!");
+				_log.warning(RequestAcquireSkillInfo.class.getSimpleName() + ": Player " + activeChar.getName() + " is requesting info for a skill that already knows, Id: " + _id + " level: " + _level + "!");
 			}
 			else if (prevSkillLevel != (_level - 1))
 			{