The event is not cancelable.

The event does not have a result.

It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

ZenScript
 Copy
import crafttweaker.forge.api.event.entity.living.effect.MobEffectEvent;

MobEffectEvent extends LivingEvent. That means all methods available in LivingEvent are also available in MobEffectEvent

Name	Type	Has Getter	Has Setter
Name effectInstance	Type MobEffectInstance?	Has Getter true	Has Setter false