diff --git a/NMS/API/src/main/java/com/willfp/illusioner/nms/api/IllusionerWrapper.java b/NMS/API/src/main/java/com/willfp/illusioner/nms/api/IllusionerWrapper.java
index 80e7170..7dfa5d4 100644
--- a/NMS/API/src/main/java/com/willfp/illusioner/nms/api/IllusionerWrapper.java
+++ b/NMS/API/src/main/java/com/willfp/illusioner/nms/api/IllusionerWrapper.java
@@ -7,4 +7,5 @@ import org.bukkit.Location;
  */
 public interface IllusionerWrapper {
     EntityIllusionerWrapper spawn(Location location, double maxHealth, double attackDamage, String name);
+    EntityIllusionerWrapper adapt(org.bukkit.entity.Illusioner illusioner, Location location, double maxHealth, double attackDamage, String name);
 }
\ No newline at end of file
diff --git a/NMS/v1_15_R1/src/main/java/com/willfp/illusioner/v1_15_R1/Illusioner.java b/NMS/v1_15_R1/src/main/java/com/willfp/illusioner/v1_15_R1/Illusioner.java
index 4d92e2f..547983f 100644
--- a/NMS/v1_15_R1/src/main/java/com/willfp/illusioner/v1_15_R1/Illusioner.java
+++ b/NMS/v1_15_R1/src/main/java/com/willfp/illusioner/v1_15_R1/Illusioner.java
@@ -4,6 +4,7 @@ import com.willfp.illusioner.nms.api.EntityIllusionerWrapper;
 import com.willfp.illusioner.nms.api.IllusionerWrapper;
 import org.bukkit.Location;
 import org.bukkit.craftbukkit.v1_15_R1.CraftWorld;
+import org.bukkit.craftbukkit.v1_15_R1.entity.CraftIllusioner;
 
 public class Illusioner implements IllusionerWrapper {
     @Override
@@ -12,4 +13,12 @@ public class Illusioner implements IllusionerWrapper {
         ((CraftWorld) location.getWorld()).getHandle().addEntity(illusioner);
         return illusioner;
     }
+
+    @Override
+    public EntityIllusionerWrapper adapt(org.bukkit.entity.Illusioner illusioner, Location location, double maxHealth, double attackDamage, String name) {
+        EntityIllusioner internalIllusioner = new EntityIllusioner(location, maxHealth, attackDamage, name);
+        if(!(illusioner instanceof CraftIllusioner)) return null;
+        ((CraftIllusioner) illusioner).setHandle(internalIllusioner);
+        return internalIllusioner;
+    }
 }
diff --git a/NMS/v1_16_R1/src/main/java/com/willfp/illusioner/v1_16_R1/Illusioner.java b/NMS/v1_16_R1/src/main/java/com/willfp/illusioner/v1_16_R1/Illusioner.java
index da0fb37..149d543 100644
--- a/NMS/v1_16_R1/src/main/java/com/willfp/illusioner/v1_16_R1/Illusioner.java
+++ b/NMS/v1_16_R1/src/main/java/com/willfp/illusioner/v1_16_R1/Illusioner.java
@@ -4,6 +4,7 @@ import com.willfp.illusioner.nms.api.EntityIllusionerWrapper;
 import com.willfp.illusioner.nms.api.IllusionerWrapper;
 import org.bukkit.Location;
 import org.bukkit.craftbukkit.v1_16_R1.CraftWorld;
+import org.bukkit.craftbukkit.v1_16_R1.entity.CraftIllusioner;
 
 public class Illusioner implements IllusionerWrapper {
     @Override
@@ -12,4 +13,12 @@ public class Illusioner implements IllusionerWrapper {
         ((CraftWorld) location.getWorld()).getHandle().addEntity(illusioner);
         return illusioner;
     }
+
+    @Override
+    public EntityIllusionerWrapper adapt(org.bukkit.entity.Illusioner illusioner, Location location, double maxHealth, double attackDamage, String name) {
+        EntityIllusioner internalIllusioner = new EntityIllusioner(location, maxHealth, attackDamage, name);
+        if(!(illusioner instanceof CraftIllusioner)) return null;
+        ((CraftIllusioner) illusioner).setHandle(internalIllusioner);
+        return internalIllusioner;
+    }
 }
diff --git a/NMS/v1_16_R2/src/main/java/com/willfp/illusioner/v1_16_R2/Illusioner.java b/NMS/v1_16_R2/src/main/java/com/willfp/illusioner/v1_16_R2/Illusioner.java
index 1b4d12d..19c7414 100644
--- a/NMS/v1_16_R2/src/main/java/com/willfp/illusioner/v1_16_R2/Illusioner.java
+++ b/NMS/v1_16_R2/src/main/java/com/willfp/illusioner/v1_16_R2/Illusioner.java
@@ -4,6 +4,7 @@ import com.willfp.illusioner.nms.api.EntityIllusionerWrapper;
 import com.willfp.illusioner.nms.api.IllusionerWrapper;
 import org.bukkit.Location;
 import org.bukkit.craftbukkit.v1_16_R2.CraftWorld;
+import org.bukkit.craftbukkit.v1_16_R2.entity.CraftIllusioner;
 
 public class Illusioner implements IllusionerWrapper {
     @Override
@@ -12,4 +13,12 @@ public class Illusioner implements IllusionerWrapper {
         ((CraftWorld) location.getWorld()).getHandle().addEntity(illusioner);
         return illusioner;
     }
+
+    @Override
+    public EntityIllusionerWrapper adapt(org.bukkit.entity.Illusioner illusioner, Location location, double maxHealth, double attackDamage, String name) {
+        EntityIllusioner internalIllusioner = new EntityIllusioner(location, maxHealth, attackDamage, name);
+        if(!(illusioner instanceof CraftIllusioner)) return null;
+        ((CraftIllusioner) illusioner).setHandle(internalIllusioner);
+        return internalIllusioner;
+    }
 }
diff --git a/NMS/v1_16_R3/src/main/java/com/willfp/illusioner/v1_16_R3/Illusioner.java b/NMS/v1_16_R3/src/main/java/com/willfp/illusioner/v1_16_R3/Illusioner.java
index 6cc6425..6098451 100644
--- a/NMS/v1_16_R3/src/main/java/com/willfp/illusioner/v1_16_R3/Illusioner.java
+++ b/NMS/v1_16_R3/src/main/java/com/willfp/illusioner/v1_16_R3/Illusioner.java
@@ -4,6 +4,7 @@ import com.willfp.illusioner.nms.api.EntityIllusionerWrapper;
 import com.willfp.illusioner.nms.api.IllusionerWrapper;
 import org.bukkit.Location;
 import org.bukkit.craftbukkit.v1_16_R3.CraftWorld;
+import org.bukkit.craftbukkit.v1_16_R3.entity.CraftIllusioner;
 
 public class Illusioner implements IllusionerWrapper {
     @Override
@@ -12,4 +13,12 @@ public class Illusioner implements IllusionerWrapper {
         ((CraftWorld) location.getWorld()).getHandle().addEntity(illusioner);
         return illusioner;
     }
+
+    @Override
+    public EntityIllusionerWrapper adapt(org.bukkit.entity.Illusioner illusioner, Location location, double maxHealth, double attackDamage, String name) {
+        EntityIllusioner internalIllusioner = new EntityIllusioner(location, maxHealth, attackDamage, name);
+        if(!(illusioner instanceof CraftIllusioner)) return null;
+        ((CraftIllusioner) illusioner).setHandle(internalIllusioner);
+        return internalIllusioner;
+    }
 }
diff --git a/Plugin/src/main/java/com/willfp/illusioner/illusioner/listeners/SpawnListeners.java b/Plugin/src/main/java/com/willfp/illusioner/illusioner/listeners/SpawnListeners.java
index eb87e18..5ade902 100644
--- a/Plugin/src/main/java/com/willfp/illusioner/illusioner/listeners/SpawnListeners.java
+++ b/Plugin/src/main/java/com/willfp/illusioner/illusioner/listeners/SpawnListeners.java
@@ -7,9 +7,11 @@ import com.willfp.illusioner.nms.NMSIllusioner;
 import com.willfp.illusioner.nms.api.EntityIllusionerWrapper;
 import org.bukkit.Material;
 import org.bukkit.block.Block;
+import org.bukkit.entity.Illusioner;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.Listener;
 import org.bukkit.event.block.BlockPlaceEvent;
+import org.bukkit.event.entity.EntitySpawnEvent;
 
 import java.util.HashSet;
 import java.util.Set;
@@ -62,4 +64,15 @@ public class SpawnListeners implements Listener {
         EntityIllusionerWrapper illusioner = NMSIllusioner.spawn(event.getBlock().getLocation(), IllusionerManager.OPTIONS.getMaxHealth(), IllusionerManager.OPTIONS.getAttackDamage(), IllusionerManager.OPTIONS.getName());
         illusioner.createBossbar(IllusionerPlugin.getInstance(), IllusionerManager.OPTIONS.getColor(), IllusionerManager.OPTIONS.getStyle());
     }
+
+    @EventHandler
+    public void onExternalSpawn(EntitySpawnEvent event) {
+        if(!(event.getEntity() instanceof Illusioner))
+            return;
+
+        Illusioner illusioner = (Illusioner) event.getEntity();
+        EntityIllusionerWrapper internalIllusioner = NMSIllusioner.convertIllusioner(illusioner, IllusionerManager.OPTIONS.getMaxHealth(), IllusionerManager.OPTIONS.getAttackDamage(), IllusionerManager.OPTIONS.getName());
+        if(internalIllusioner == null) return;
+        internalIllusioner.createBossbar(IllusionerPlugin.getInstance(), IllusionerManager.OPTIONS.getColor(), IllusionerManager.OPTIONS.getStyle());
+    }
 }
diff --git a/Plugin/src/main/java/com/willfp/illusioner/nms/NMSIllusioner.java b/Plugin/src/main/java/com/willfp/illusioner/nms/NMSIllusioner.java
index fb81cfd..819f5bd 100644
--- a/Plugin/src/main/java/com/willfp/illusioner/nms/NMSIllusioner.java
+++ b/Plugin/src/main/java/com/willfp/illusioner/nms/NMSIllusioner.java
@@ -4,6 +4,7 @@ import com.willfp.illusioner.IllusionerPlugin;
 import com.willfp.illusioner.nms.api.EntityIllusionerWrapper;
 import com.willfp.illusioner.nms.api.IllusionerWrapper;
 import org.bukkit.Location;
+import org.bukkit.entity.Illusioner;
 import org.jetbrains.annotations.ApiStatus;
 
 /**
@@ -39,4 +40,18 @@ public class NMSIllusioner {
         assert illusionerWrapper != null;
         return illusionerWrapper.spawn(location, maxHealth, attackDamage, name);
     }
+
+    /**
+     * Adapt an existing Illusioner into an Illusioner boss
+     *
+     * @param illusioner   The Illusioner to adapt
+     * @param maxHealth    The max health for the illusioner to have
+     * @param attackDamage The attack damage for the illusioner
+     * @param name         The name of the Illusioner
+     * @return The illusioner
+     */
+    public static EntityIllusionerWrapper convertIllusioner(Illusioner illusioner, double maxHealth, double attackDamage, String name) {
+        assert illusionerWrapper != null;
+        return illusionerWrapper.adapt(illusioner, illusioner.getLocation(), maxHealth, attackDamage, name);
+    }
 }