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.xp.PlayerXpLevelChangeEvent;

PlayerXpLevelChangeEvent extends PlayerXpEvent. That means all methods available in PlayerXpEvent are also available in PlayerXpLevelChangeEvent

Name	Type	Has Getter	Has Setter
Name levels	Type int	Has Getter true	Has Setter true