diff --git a/patches/api/Missing-Entity-Behavior-API.patch b/patches/api/Missing-Entity-Behavior-API.patch
index a0d2e41f70..0b833ba2b0 100644
--- a/patches/api/Missing-Entity-Behavior-API.patch
+++ b/patches/api/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 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
@@ -1113,6 +1114,26 @@ diff --git a/src/main/java/org/bukkit/entity/Wither.java b/src/main/java/org/buk
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
 --- a/src/main/java/org/bukkit/entity/Wither.java
 +++ b/src/main/java/org/bukkit/entity/Wither.java
+@@ -0,0 +0,0 @@ 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();
+ 
+     /**
+@@ -0,0 +0,0 @@ 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);
+ 
+     /**
 @@ -0,0 +0,0 @@ public interface Wither extends Monster, Boss, com.destroystokyo.paper.entity.Ra
          LEFT,
          RIGHT
@@ -1147,6 +1168,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @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/Missing-Entity-Behavior-API.patch b/patches/server/Missing-Entity-Behavior-API.patch
index 134a214c2a..f15a52d6d8 100644
--- a/patches/server/Missing-Entity-Behavior-API.patch
+++ b/patches/server/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 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
@@ -1237,5 +1238,10 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    public void setCanTravelThroughPortals(boolean value) {
 +        getHandle().setCanTravelThroughPortals(value);
 +    }
++
++    @Override
++    public void enterInvulnerabilityPhase() {
++        this.getHandle().makeInvulnerable();
++    }
 +    // Paper end
  }