NPC are immune to all

src/engine/objects/NPC.java

@@ -974,6 +974,7 @@ public class NPC extends AbstractCharacter {
 
             //apply NPC rune effects
             NPCManager.applyRunesForNPC(this);
+            this.resists.setImmuneToAll(true);
 
         } catch (Exception e) {
             Logger.error(e.getMessage());