Done my research and haven't been able to find anything that points to these checks from a Common Event.
I can't seem to find a way to make this work properly.
Similar to FFX Celestial Weapons (or all FF weapons for the most part).
Tidus' Caladbolg has a damage formula of (10 + [100 * User's current HP ÷ User's Max HP]) ÷ 110.
Try updating to the latest version of El Capitan. Apple is currently at 10.11.3 and you are running 10.11.1.
If you still experience crashes use Disk Utility in your Applications > Utilities folder to see if you have any disk / directory issues.
Also try another user to see if...
The EULA in the Essentials pack under section 3 reads as follows:
"The resources in RPG Maker MV - Essentials Set are created for use in game development only, using RPG Maker MV only. Alternatively, you may also use these materials with other RPG Makers, as long as you have a valid and legal...