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.player.CriticalHitEvent;

CriticalHitEvent extends PlayerEvent. That means all methods available in PlayerEvent are also available in CriticalHitEvent

Name	Type	Has Getter	Has Setter
Name damageModifier	Type CriticalHitEvent	Has Getter true	Has Setter true
Name isVanillaCritical	Type boolean	Has Getter true	Has Setter false
Name oldDamageModifier	Type float	Has Getter true	Has Setter false
Name target	Type Entity	Has Getter true	Has Setter false