Mods involved
Ancient Spellcraft 1.2.3
jei_1.12.2-4.16.1.301
ElectroblobsWizardry-4.3.4-MC1.12.2

When having the spell dagger in your inventory if you equip a full set of none elemental battle mage armour your game will crash
with a ticking player the only fix is deleting the item with an nbt editor from your inventory.
https://streamable.com/zh1176

crash-2022-01-08_00.04.24-server.txt
latest.log

Encountered the same issue
From the Roguelike Adventures and Dungeons modpack version 1.49 of the pack

On GD Launcher

latest.log
crash-2022-01-07_17.03.34-server.txt

Additional crashes on GD Launcher that I don't have the latest.log file for
crash-2022-01-07_18.11.06-server.txt
crash-2022-01-07_17.35.00-server.txt
crash-2022-01-07_16.58.55-server.txt
crash-2022-01-07_19.06.07-server.txt

Multi MC Launcher
latest.log
crash-2022-01-07_19.28.26-server.txt

This should be fixed already in the latest versions