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Minecraft version: 1.12.2
Wizardry version: 4.2.1
Environment: Singleplayer

Issue details: killing wizards that a lightning pedestal spawned
Other mods involved: seemingly none

Link to crash report (if applicable):
crash-2019-08-24_13.11.31-server.txt

Ok I think I know what's happened there. Thanks for reporting, will fix for the next patch.