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.living.LivingAttackEvent;

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

Name	Type	Has Getter	Has Setter
Name amount	Type float	Has Getter true	Has Setter false
Name source	Type DamageSource	Has Getter true	Has Setter false