Minecraft version: 1.12.2
Wizardry version: 4.2.1
Environment: Singleplayer

Issue details: Rightclicked on a mob with an unidentified spell which led to a crash

Link to crash report (if applicable): https://paste.dimdev.org/tamevikuyo.mccrash

Okay that's an interesting one, I think I know what's caused it. Thanks for reporting, will fix for the next patch.