Im trying to enchant an Emerald Sword(Cyclic) with Soul Stealer 3 but I get the following crash:
https://paste.gg/p/anonymous/b0f5ed2b426040df89c3dace35b2f874

Does it happen with any sword? Does it happen with only Soul Shards installed?

I am unable to reproduce this is in dev. I can only assume some mod is coremodding into isCompatibleWith and doing something wrong..

Tested it too and can approve that some other mod seems to be the problem - Ill try some mods and see which one it could be.

Ok so seems like it only happens in one specific world of mine.

That's... very strange. There's nothing in that method that should NPE... Have you removed any mods that included enchantments in the past?

I remember now I just had another enchantment on it which has not been shown but I could see it in the NBT data

@TehNut anyway which Tier do I need to spawn mobs in another dimension - its not stated on the project page https://minecraft.curseforge.com/projects/soul-shards-respawn?gameCategorySlug=mc-mods&projectID=291549

There's no dimension checks in this version. I may add it in the future, but it's very hard to do the detection for that with mods.

So I need to spawn them in their own dim?

You can spawn anything in any dimension. The check simply isn't there. If something is stopping an entity from being spawned, that's being done by another mod.