A player reported crashing after become a Lich using Goety and after checking the logs BadOptimisations was revealed to be the culprit with "java.lang.IncompatibleClassChangeError: BadOptimizations: unexpected player model type goety:lich"
The player could get back to his world after removing BadOptimisations altho with a few missing textures in his lich model
Forge 1.20.1
Goety 2.5.32
BadOptimizations 2.2.1

Crashlog
latest

Tf

This some terreria type stuff

This attempts to implement a fix without marking them incompatible. Does it work?
BadOptimizations-2.2.1-1.20.zip
I'm sorry for the late reply, I got dragged into some work by a friend.

How do you become a "lich" in this mod? May be able to do it myself

published as 2.2.2

I have no idea what issue it was, but apparently Goety Revelation's author stated Apostle/Apollon cannot be properly defeated with Bad Optimizations, or this handled with recent update on both ends?

It was fixed in version 2.2.2 of BadOptimizations on my end.