[Suzerain of Sheol]

Um... hmm, lots to think about.

Salone, I think it would bestow a measure of power over the demon. Not complete control, but a very forceful coercion.

And, Dolly, that could certainly work. Would have to come up with a suitable foe to do so, and also a way for us not to get destroyed along with it.

And, I'm not really sure on the last point. They might be able to delude themselves by wielding powers granted by other demons and convincing themselves it all comes from him. *shrugs* I don't really care either way. You can take it in any direction you want.