Zariel is unlikely but possible, her failure to acquire the city of Elturel in the Descent into Avernus has no doubt damaged her standing in the eyes of Asmodeus, and her fate is largely dependent on the players. They can kill her (permanently since she is her home plane), redeem her, serve her, usurp her, replace her with her rival Bel (former lord of Avernus), the list is endless. But the forces of hell are no doubt interested in the story of the game, Raphael's presence is proof of that and Wyll the origin character and potential player character has a pact of some sort with a Devil (no idea who).
