It shows item.twilightforest.fiery_sword.tooltip etc on all of the fiery and knightmetal weapons.

I don't want to retranslate content from other mods, so I directly reference their language file, which leads to this happening if they change it.

I assume this is on Forge? I'll fix this next update, thanks for the heads up.

Ah cool, that makes sense. Yup it's on Forge. Thank you!