I know the older editions had a book that addressed questions like this, But I got to thinking about building a fiend warlock who is a former God stripped of their divinity and immortality, but given a deal by an Archdevil to regain a fraction of their power. To me this is an interesting concept, a former god of war cursed with mortality and forced to reconcile not only with the remaining members of their church, but deal with the consequences of blessing an insane amount of armies and being responsible for an uncountable amount of deaths because of their apathy towards those caught in the crossfire of their wars.