Util.java

    public static void setDamage(EntityDamageEvent event, double dmg) {
        if (event.getFinalDamage() == 0) {
            if (dmg != 0) {
                event.setDamage(dmg);
            }
            return;
        }
        final double ratio = dmg / event.getFinalDamage();
        for (DamageModifier mod : DamageModifier.values()) {
            if (event.isApplicable(mod)) {
                event.setDamage(mod, event.getDamage(mod) * ratio);
            }
        }
    }