I shall admit even I am still trying to wrap my head around devil bones. Is it the skeleton of a devil? Meaning a devil died but then decomposed like an ordinary creature and was later reanimated? By what, a different also-regular devil? Why? Demons are literal hellspawn! Just make a new one! Alternatively, is this the devil bones' natural state, bones from the start? Why go to the trouble of making a demon held together by nothing but magic and, what, good balance?? At least put a little skin or sinew on there, keep things together! At any rate, battle this clickety-clacking enigma just the way you'd expect - with magic of any kind. And if all else fails, just give it a good whack with a blunt object and send those bones flying.
