AEAPI.registerEffect(instance, "MULTIPLY_DAMAGE", new CustomEffect() {
public boolean onEffectActivation(EffectActivationEvent event) {
if(!event.getEnchantmentType().equals(AEnchantmentType.ATTACK))
if(event.getArgs().length == 0)
double damage = ((EntityDamageByEntityEvent) event.getEnchantmentEvent()).getDamage();
String multiplierString = event.getArgs()[0].replaceAll("[^0-9]", "");
double multiplier = Double.parseDouble(multiplierString);
event.getVictim().damage(damage * multiplier, event.getAttacker());