Support for this mod: https://www.curseforge.com/minecraft/mc-mods/fabric-netherited
Doesn't have a description that I can find, but a simple 'Fireproof' or 'Item won't burn in lava or fire' could work.
Thanks!

I've submitted a Pull Request to the netherited author that will add support. You can track that PR here:

• polpg/Netherited#5

Support has now been added to the original mod. Please wait for them to release an update.