When I open the inventory, JEI gives most DivineRPG weapons a tooltip error, tells me to see the logs. Errors seem to start around the 02:44:44 timestamp, if that helps anyone to find something useful in the log. The game will also crash if I try to craft one of the weapons and mouse over it in the crafting table, which... Yeah, don't know what else I expected.

latest.log

Okay so I have no idea how this fixed it, but updating Curios and GeckoLib to the current up-to-date versions(5.7.2 and 4.4.4 respectively) worked...