Notice how they're missing proper langer files. Obscuria tooltips with special items tend to look like this

Here's what the dev suggests:

rarity.alexscaves.nuclear.name
rarity.alexscaves.demonic.name
seems to be waht its asking for. And yeah i tried looking for a github but i think its entirely closed source lol

would be a lot easier to fix if I could get a clear screenshot that isnt too blurry so I can read the translation key it wants. Or you know, if the mod's source was available for people to troubleshoot with.