Minecraft version: 1.12.2
Wizardry version: 4.3.4
Environment: Singleplayer

Issue details: Shot arrows at an ancientwarfare NPC it should have either dodged or got hit but the game just crashed instead and vanilla fix and what I checked said Improved mobs and this mod had something to do with it(I'm not sure sure though)

Other mods involved: Improved Mobs mod

Link to crash report (if applicable):
crash-2021-09-09_20.20.27-server.txt

This is caused by improvedmobs mod trying to some custom logic into a freshly spawned wizard in a world gen wizard tower. Check the mod's configs how you can blacklist the wizard entity or consult with the dev of improvedmobs.