Describe the bug
Repeated crashes on server linked to aurorian steel. It happens when one player is fighting a custom npc while Aurorian Steel Armor was equipped.

To Reproduce
Sorry, but I am struggling to figure this out, I will edit if I figure it out more, the report below is the best I have.

Versions/Environment

• Aurorian Version: theaurorian-1.12.2-release-may3021.jar
• Jojovein Modpack

If you have a Crash Log
https://pastebin.com/3qGxZ0Hg