Yeah, Death Metal was created out of magically enhanced promethium from the armor of a Skyfather-type being called Charnel.
So I doubt taking him over would work. Neither would BFR....apparently he can dimension hop (surprisingly enough). And even the most powerful have only been able to harm him briefly (even metal manipulators like Box), and that's usually because he's letting them (part of him wants to die because he knows the monster he is).
Anyway, Death Metal wins.