The Demon Lord Yeenoghu baits the Zarielite Crusaders into attacking him near the village of Idyllglen. During the battle, Yeenoghu grabbed General Yael and fled through a portal to Avernus. The crusaders followed after, nearly destroying the demon lord's army, before an army of devils arrived.
Jander Sunstar fled the battle with a large chunk of the army and the portal closed behind them. In the resulting three-way battle, the Hellriders were destroyed, though not before Zariel slew a member of the Dark Eight. Feeling herself slipping, Zariel ordered Yael and Lulu to flee with her sword.
Afterwards, Zariel was given the offer to be reborn as an archdevil by Asmodeus, which she accepted.