So, this thing comes from this creature (the thing below 👇) which doesn't have an exact name but I have some ideas like 'Broken Spirit/Soul' or 'Corrupted Spirit/Soul' or smith like that and it's basically a normal skeletic with schizophrenia that has basically taken over them. This creature is based on the RunSonic! story (if you don't know it then search it up).

So, uhh ye The Cursed Jaw is basically the jaw of this thing. A skeletic gets it when defeating this thing and wears the jaw like a champion. The skeletic can wear it like a helmet. It will have some effects/powers but I haven't thinked about that for now.