Tomas leads twelve survivors through underground passages. They find mushroom gallery providing first real food in days. Continue climbing toward surface. Encounter dead soldiers with scratches indicating a way up. Follow the passage through treacherous climbs.

Cael leads a group of survivors north toward fortress. They encounter corrupted sky and demons everywhere. They rescue a family hiding in a root cellar, then recruit seven bandits who were attempting robbery. Cael and Vessa discuss whether survival is worthwhile.

Demons attack the volunteer barracks targeting recruits specifically. Tomas is wounded defending Sarah and other volunteers but fights through. Eighty people die (thirty-seven volunteers, forty-three soldiers). Lucien returns from checking on his home—finding everything burned and Anne dead.

Tomas and the survivors encounter a Wurm in the underground - a lesser creature than the sealed Wurm Lords but still deadly. After Brennan falls, Tomas charges with the Progenitor sword and drives it into the Wurm open mouth, conducting its own fire back into its body and killing it.

Cael discovers that forty-seven of five hundred volunteers are corrupted by demonic influence, contaminating them unknowingly. With only nine percent corruption rate, the math demands recruiting seven thousand seven hundred volunteers total to get six thousand clean participants.

One week after the first ritual, Tomas traumatized by witnessing nine hundred fifty-seven deaths. Father Aldous arrives with dangerous intelligence: rituals may strengthen Wurm Lords while buying time.

Cael and survivors encounter Commander Vessa's organized refugee group. They share resources and stories. Three demons attack the camp; the group collectively defeats them through tactics and sacrifice.

The Martyr's Brigade prepares for the first ritual. One thousand volunteers spend their final night together sharing stories and finding peace. Tomas and Cael witness their acceptance of death. The march to the seal chamber costs forty-three lives before the ritual begins.

Brennan's group descends deeper into Progenitor tunnels, losing members to hazards and despair. Ilara discovers archive revealing seals require seven thousand sacrifices and were created ten thousand years ago—meaning they're failing now. The group faces existential dread.