diff --git a/L2J_Mobius_Classic_3.0_TheKamael/dist/game/data/scripts/handlers/EffectMasterHandler.java b/L2J_Mobius_Classic_3.0_TheKamael/dist/game/data/scripts/handlers/EffectMasterHandler.java
index 616fb02639..cdc2c4f1c5 100644
--- a/L2J_Mobius_Classic_3.0_TheKamael/dist/game/data/scripts/handlers/EffectMasterHandler.java
+++ b/L2J_Mobius_Classic_3.0_TheKamael/dist/game/data/scripts/handlers/EffectMasterHandler.java
@@ -300,6 +300,7 @@ public class EffectMasterHandler
 		EffectHandler.getInstance().registerHandler("ReflectSkill", ReflectSkill::new);
 		EffectHandler.getInstance().registerHandler("RefuelAirship", RefuelAirship::new);
 		EffectHandler.getInstance().registerHandler("Relax", Relax::new);
+		EffectHandler.getInstance().registerHandler("ReplaceSkillBySkill", ReplaceSkillBySkill::new);
 		EffectHandler.getInstance().registerHandler("ResetInstanceEntry", ResetInstanceEntry::new);
 		EffectHandler.getInstance().registerHandler("ResistAbnormalByCategory", ResistAbnormalByCategory::new);
 		EffectHandler.getInstance().registerHandler("ResistDDMagic", ResistDDMagic::new);
diff --git a/L2J_Mobius_Classic_3.0_TheKamael/dist/game/data/scripts/handlers/effecthandlers/ReplaceSkillBySkill.java b/L2J_Mobius_Classic_3.0_TheKamael/dist/game/data/scripts/handlers/effecthandlers/ReplaceSkillBySkill.java
new file mode 100644
index 0000000000..863a5fa245
--- /dev/null
+++ b/L2J_Mobius_Classic_3.0_TheKamael/dist/game/data/scripts/handlers/effecthandlers/ReplaceSkillBySkill.java
@@ -0,0 +1,113 @@
+/*
+ * This file is part of the L2J Mobius project.
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+package handlers.effecthandlers;
+
+import org.l2jmobius.commons.threads.ThreadPool;
+import org.l2jmobius.gameserver.data.xml.SkillData;
+import org.l2jmobius.gameserver.enums.ShortcutType;
+import org.l2jmobius.gameserver.model.Shortcut;
+import org.l2jmobius.gameserver.model.StatSet;
+import org.l2jmobius.gameserver.model.actor.Creature;
+import org.l2jmobius.gameserver.model.actor.Player;
+import org.l2jmobius.gameserver.model.effects.AbstractEffect;
+import org.l2jmobius.gameserver.model.holders.SkillHolder;
+import org.l2jmobius.gameserver.model.item.instance.Item;
+import org.l2jmobius.gameserver.model.skill.Skill;
+import org.l2jmobius.gameserver.network.serverpackets.ShortCutInit;
+import org.l2jmobius.gameserver.network.serverpackets.ShortCutRegister;
+
+/**
+ * @author Mobius
+ */
+public class ReplaceSkillBySkill extends AbstractEffect
+{
+	private final SkillHolder _existingSkill;
+	private final SkillHolder _replacementSkill;
+	
+	public ReplaceSkillBySkill(StatSet params)
+	{
+		_existingSkill = new SkillHolder(params.getInt("existingSkillId"), params.getInt("existingSkillLevel", -1));
+		_replacementSkill = new SkillHolder(params.getInt("replacementSkillId"), params.getInt("replacementSkillLevel", -1));
+	}
+	
+	@Override
+	public void onStart(Creature effector, Creature effected, Skill skill, Item item)
+	{
+		if (effected.isPlayer())
+		{
+			final Player player = effected.getActingPlayer();
+			final Skill knownSkill = player.getKnownSkill(_existingSkill.getSkillId());
+			if ((knownSkill == null) || (knownSkill.getLevel() < _existingSkill.getSkillLevel()))
+			{
+				return;
+			}
+			
+			final Skill addedSkill = SkillData.getInstance().getSkill(_replacementSkill.getSkillId(), _replacementSkill.getSkillLevel() < 1 ? knownSkill.getLevel() : _replacementSkill.getSkillLevel(), knownSkill.getSubLevel());
+			player.addSkill(addedSkill, false);
+			player.addReplacedSkill(_existingSkill.getSkillId());
+			for (Shortcut shortcut : player.getAllShortCuts())
+			{
+				if ((shortcut.getType() == ShortcutType.SKILL) && (shortcut.getId() == knownSkill.getId()) && (shortcut.getLevel() == knownSkill.getLevel()))
+				{
+					final int slot = shortcut.getSlot();
+					final int page = shortcut.getPage();
+					final int characterType = shortcut.getCharacterType();
+					player.deleteShortCut(slot, page);
+					final Shortcut newShortcut = new Shortcut(slot, page, ShortcutType.SKILL, addedSkill.getId(), addedSkill.getLevel(), addedSkill.getSubLevel(), characterType);
+					player.registerShortCut(newShortcut);
+					player.sendPacket(new ShortCutRegister(newShortcut));
+				}
+			}
+			
+			player.removeSkill(knownSkill, false);
+			player.sendSkillList();
+			ThreadPool.schedule(() -> player.sendPacket(new ShortCutInit(player)), 1100);
+		}
+	}
+	
+	@Override
+	public void onExit(Creature effector, Creature effected, Skill skill)
+	{
+		final Player player = effected.getActingPlayer();
+		final Skill knownSkill = player.getKnownSkill(_replacementSkill.getSkillId());
+		if (knownSkill == null)
+		{
+			return;
+		}
+		
+		final Skill addedSkill = SkillData.getInstance().getSkill(_existingSkill.getSkillId(), _existingSkill.getSkillLevel() < 1 ? knownSkill.getLevel() : _existingSkill.getSkillLevel(), knownSkill.getSubLevel());
+		player.addSkill(addedSkill, false);
+		player.removeReplacedSkill(_existingSkill.getSkillId());
+		for (Shortcut shortcut : player.getAllShortCuts())
+		{
+			if ((shortcut.getType() == ShortcutType.SKILL) && (shortcut.getId() == knownSkill.getId()) && (shortcut.getLevel() == knownSkill.getLevel()))
+			{
+				final int slot = shortcut.getSlot();
+				final int page = shortcut.getPage();
+				final int characterType = shortcut.getCharacterType();
+				player.deleteShortCut(slot, page);
+				final Shortcut newShortcut = new Shortcut(slot, page, ShortcutType.SKILL, addedSkill.getId(), addedSkill.getLevel(), addedSkill.getSubLevel(), characterType);
+				player.registerShortCut(newShortcut);
+				player.sendPacket(new ShortCutRegister(newShortcut));
+			}
+		}
+		
+		player.removeSkill(knownSkill, false);
+		player.sendSkillList();
+		ThreadPool.schedule(() -> player.sendPacket(new ShortCutInit(player)), 1100);
+	}
+}
diff --git a/L2J_Mobius_Classic_3.0_TheKamael/dist/game/data/stats/skills/documentation.txt b/L2J_Mobius_Classic_3.0_TheKamael/dist/game/data/stats/skills/documentation.txt
index f55aaa429a..4acf346d5f 100644
--- a/L2J_Mobius_Classic_3.0_TheKamael/dist/game/data/stats/skills/documentation.txt
+++ b/L2J_Mobius_Classic_3.0_TheKamael/dist/game/data/stats/skills/documentation.txt
@@ -269,6 +269,7 @@ ReflectMagic: Deflects magical damage back to the attacker.
 ReflectSkill: Deflects physical/magical debuffs back to the attacker.
 RefuelAirship: Increases Airship's fuel.
 Relax: Sits down and increases HP regeneration until full.
+ReplaceSkillBySkill: While active replaces a skill with an alternative skill. (l2jmobius)
 ResetInstanceEntry: Resets instance re-entry time. (l2jmobius)
 ResistAbnormalByCategory: Buff/debuff resist stat.
 ResistDDMagic: Magic resist stat (magic attack 50% effective or 1 damage)
diff --git a/L2J_Mobius_Classic_3.0_TheKamael/java/org/l2jmobius/gameserver/data/xml/SkillTreeData.java b/L2J_Mobius_Classic_3.0_TheKamael/java/org/l2jmobius/gameserver/data/xml/SkillTreeData.java
index 31807c7155..0eeba39fa5 100644
--- a/L2J_Mobius_Classic_3.0_TheKamael/java/org/l2jmobius/gameserver/data/xml/SkillTreeData.java
+++ b/L2J_Mobius_Classic_3.0_TheKamael/java/org/l2jmobius/gameserver/data/xml/SkillTreeData.java
@@ -703,6 +703,11 @@ public class SkillTreeData implements IXmlReader
 				continue;
 			}
 			
+			if (player.hasReplacedSkill(skill.getSkillId()))
+			{
+				continue;
+			}
+			
 			if (player.getLevel() >= skill.getGetLevel())
 			{
 				if (skill.getSkillLevel() > SkillData.getInstance().getMaxLevel(skill.getSkillId()))
@@ -1477,6 +1482,11 @@ public class SkillTreeData implements IXmlReader
 					continue;
 				}
 				
+				if (player.hasReplacedSkill(skill.getSkillId()))
+				{
+					continue;
+				}
+				
 				if (minLevelForNewSkill <= skill.getGetLevel())
 				{
 					final Skill oldSkill = player.getKnownSkill(skill.getSkillId());
diff --git a/L2J_Mobius_Classic_3.0_TheKamael/java/org/l2jmobius/gameserver/model/actor/Player.java b/L2J_Mobius_Classic_3.0_TheKamael/java/org/l2jmobius/gameserver/model/actor/Player.java
index e084868fd0..6fd59e7689 100644
--- a/L2J_Mobius_Classic_3.0_TheKamael/java/org/l2jmobius/gameserver/model/actor/Player.java
+++ b/L2J_Mobius_Classic_3.0_TheKamael/java/org/l2jmobius/gameserver/model/actor/Player.java
@@ -828,6 +828,7 @@ public class Player extends Playable
 	
 	/** Map containing all custom skills of this player. */
 	private Map<Integer, Skill> _customSkills = null;
+	public final Set<Integer> _replacedSkills = ConcurrentHashMap.newKeySet(1);
 	
 	private volatile int _actionMask;
 	
@@ -13126,6 +13127,21 @@ public class Player extends Playable
 		}
 	}
 	
+	public void addReplacedSkill(int skillId)
+	{
+		_replacedSkills.add(skillId);
+	}
+	
+	public void removeReplacedSkill(int skillId)
+	{
+		_replacedSkills.remove(skillId);
+	}
+	
+	public boolean hasReplacedSkill(int skillId)
+	{
+		return _replacedSkills.contains(skillId);
+	}
+	
 	/**
 	 * @return {@code true} if current player can revive and shows 'To Village' button upon death, {@code false} otherwise.
 	 */