Zariel

Once an angel of mount Celestia, Zariel came to the people of Elturel in their time of need. She aided in the training of the Hellriders and rode with them into Avernus to deliver Justice to the Devils that had been terrorizing the surrounding lands. However it is now believed that Zariel was betrayed by some Hellriders who fled the battle and closed the gate. Left in Avernus to rot, evidence suggests she was turned into an Archdevil and now holds some measure of power in Avernus.