diff --git a/patches/api/0300-Missing-Entity-Behavior-API.patch b/patches/api/0300-Missing-Entity-Behavior-API.patch
index e16a4990e6..12baa90a91 100644
--- a/patches/api/0300-Missing-Entity-Behavior-API.patch
+++ b/patches/api/0300-Missing-Entity-Behavior-API.patch
@@ -7,6 +7,7 @@ Co-authored-by: Nassim Jahnke <nassim@njahnke.dev>
 Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>
 Co-authored-by: William Blake Galbreath <blake.galbreath@gmail.com>
 Co-authored-by: SoSeDiK <mrsosedik@gmail.com>
+Co-authored-by: booky10 <boooky10@gmail.com>
 
 diff --git a/src/main/java/com/destroystokyo/paper/entity/ai/VanillaGoal.java b/src/main/java/com/destroystokyo/paper/entity/ai/VanillaGoal.java
 index dddbb661265aa23f88d93d0681f418f40a872351..998f629852e1103767e005405d1f39c2251ecd28 100644
@@ -1110,10 +1111,30 @@ index 3794db8867b53f3b3735ad82fdd8765a26df2bfb..efaa45f41bc1dc8df6665c55b4e5ade3
       * Increases the anger level of this warden.
       *
 diff --git a/src/main/java/org/bukkit/entity/Wither.java b/src/main/java/org/bukkit/entity/Wither.java
-index 87a814f63c3f35be35bfa210c9248ad211c0dd8f..bc6161989876e615085ab54715f35451a2f942bb 100644
+index 87a814f63c3f35be35bfa210c9248ad211c0dd8f..14543c2238b45c526dd9aebea2aa5c22f5df54dc 100644
 --- a/src/main/java/org/bukkit/entity/Wither.java
 +++ b/src/main/java/org/bukkit/entity/Wither.java
-@@ -64,4 +64,35 @@ public interface Wither extends Monster, Boss, com.destroystokyo.paper.entity.Ra
+@@ -43,7 +43,9 @@ public interface Wither extends Monster, Boss, com.destroystokyo.paper.entity.Ra
+      * Returns the wither's current invulnerability ticks.
+      *
+      * @return amount of invulnerability ticks
++     * @deprecated Duplicate api, use {@link #getInvulnerableTicks()}
+      */
++    @Deprecated(forRemoval = true) // Paper
+     int getInvulnerabilityTicks();
+ 
+     /**
+@@ -52,7 +54,9 @@ public interface Wither extends Monster, Boss, com.destroystokyo.paper.entity.Ra
+      * When invulnerability ticks reach 0, the wither will trigger an explosion.
+      *
+      * @param ticks amount of invulnerability ticks
++     * @deprecated Duplicate api, use {@link #setInvulnerableTicks(int)}
+      */
++    @Deprecated(forRemoval = true) // Paper
+     void setInvulnerabilityTicks(int ticks);
+ 
+     /**
+@@ -64,4 +68,43 @@ public interface Wither extends Monster, Boss, com.destroystokyo.paper.entity.Ra
          LEFT,
          RIGHT
      }
@@ -1147,6 +1168,14 @@ index 87a814f63c3f35be35bfa210c9248ad211c0dd8f..bc6161989876e615085ab54715f35451
 +     * @param value whether the wither can travel through portals
 +     */
 +    void setCanTravelThroughPortals(boolean value);
++
++    /**
++     * Makes the wither invulnerable for 11 seconds and
++     * sets the health to one third of the max health.
++     * <br>
++     * This is called in vanilla directly after spawning the wither.
++     */
++    void enterInvulnerabilityPhase();
 +    // Paper end
  }
 diff --git a/src/main/java/org/bukkit/entity/ZombieVillager.java b/src/main/java/org/bukkit/entity/ZombieVillager.java
diff --git a/patches/server/0645-Missing-Entity-Behavior-API.patch b/patches/server/0645-Missing-Entity-Behavior-API.patch
index 554fac3e32..4ecfa04de0 100644
--- a/patches/server/0645-Missing-Entity-Behavior-API.patch
+++ b/patches/server/0645-Missing-Entity-Behavior-API.patch
@@ -35,6 +35,7 @@ Co-authored-by: Nassim Jahnke <nassim@njahnke.dev>
 Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>
 Co-authored-by: William Blake Galbreath <blake.galbreath@gmail.com>
 Co-authored-by: SoSeDiK <mrsosedik@gmail.com>
+Co-authored-by: booky10 <boooky10@gmail.com>
 
 diff --git a/src/main/java/com/destroystokyo/paper/entity/ai/MobGoalHelper.java b/src/main/java/com/destroystokyo/paper/entity/ai/MobGoalHelper.java
 index f80a6ad7638453348ee82ea00b166a3aac029142..a08c00b8c0488d18be5e182f7892e5ab71d12247 100644
@@ -1204,10 +1205,10 @@ index 08c55cb00c8ff3c39dd99c64227d5d60abee2a51..6ecdc4bf1f6b8f0363e667135ba46343
      public void increaseAnger(Entity entity, int increase) {
          Preconditions.checkArgument(entity != null, "Entity cannot be null");
 diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftWither.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftWither.java
-index 8c32f70ec0defa5c67f2d02d13116e27de5de76d..dab37db550a33a18f02d2404a4d6f44db7d1322b 100644
+index 8c32f70ec0defa5c67f2d02d13116e27de5de76d..1a21d30620f13a48976da5ead7edab201ea68b21 100644
 --- a/src/main/java/org/bukkit/craftbukkit/entity/CraftWither.java
 +++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftWither.java
-@@ -73,4 +73,31 @@ public class CraftWither extends CraftMonster implements Wither, com.destroystok
+@@ -73,4 +73,36 @@ public class CraftWither extends CraftMonster implements Wither, com.destroystok
  
          this.getHandle().setInvulnerableTicks(ticks);
      }
@@ -1237,5 +1238,10 @@ index 8c32f70ec0defa5c67f2d02d13116e27de5de76d..dab37db550a33a18f02d2404a4d6f44d
 +    public void setCanTravelThroughPortals(boolean value) {
 +        getHandle().setCanTravelThroughPortals(value);
 +    }
++
++    @Override
++    public void enterInvulnerabilityPhase() {
++        this.getHandle().makeInvulnerable();
++    }
 +    // Paper end
  }