In this, their darkest hour, the god Amaunator responded to their holy prayers and the Companion appeared in the skies above the city: A second sun that burned through the night and whose light no undead could endure.
Still filled with hatred for the knights who had betrayed her, she watched Elturel from afar and waited for an opportunity to present itself for revenge. Swearing fealty to Asmodeus, she became the Archdevil of Avernus. The rest of Zariel’s army was wiped out, Zariel herself was captured. Let’s back up for a second and briefly sum up the essential back story: It then proceeds almost directly to, “If the players don’t do what you tell them to do, the NPCs automatically find them and kill them.” Descent Into Avernus begins by having the PCs stand around doing nothing while the GM describes an NPC doing awesome stuff.