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
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import crafttweaker.forge.api.event.entity.EntityLeaveLevelEvent;

EntityLeaveLevelEvent extends EntityEvent. That means all methods available in EntityEvent are also available in EntityLeaveLevelEvent

Name	Type	Has Getter	Has Setter
Name level	Type Level	Has Getter true	Has Setter false