Demon Lord for Hire: A Progression Fantasy Epic

Are you a god in dire need of followers, of some more faithful to bolster your ranks? Then I'm the one you're looking for: a Demon Lord in all its glory! You may hire my services for a small fee, that is a small portion of your divinity. I will send my minions to terrorize the populace and give people a reason to pray to you. I will spawn horrors to drum up support or even trigger a holy crusade. Just sign the contract and I'll take care of everything. You won't even have to lift a finger, except maybe to bless a few heroes of your choosing to face off against my armies and eventually defeat me, the dreaded Demon Lord, in dramatic fashion. This is a bargain you can't possible pass up! But I warn you, if I hold up my end of the deal, I expect you to honor it too, or else…