Add a moment of invinsibility at the start of a nirik's rage

src/main/java/com/minelittlepony/unicopia/ability/magic/spell/RageAbilitySpell.java

@@ -111,6 +111,9 @@ public class RageAbilitySpell extends AbstractSpell {
         }
 
         age++;
+        source.asEntity().setInvulnerable(age < 25);
+
+
         setDirty();
         return true;
     }