William and his group, which includes Al, Menel, Reystov, and Ghelreis, navigate through underground tunnels where the air is stifling and visibility is poor, staying vigilant against possible demon attacks.

In the stone hall, the group encounters skeletal warriors who recognize Ghelreis. Al reveals his lineage as a descendant of King Aurvangr, convinces the skeletons of the fall of the Iron Land, and urges them to rest.

Al, inspired by his heritage, vows to reclaim the Iron Land. He faces the demon general Scarabaeus in a fierce battle, determined to keep his promise. William, the group's leader, supports Al's decision to fight Scarabaeus, seeing it as a pivotal moment for Al's growth and the reconquest of the Iron Land.

Al successfully defeats Scarabaeus, but the group remains cautious, noting that the demon's body has disappeared, suggesting an ongoing threat. The episode culminates in the group's encounter with Valacirca, the evil dragon, in the Great Cavern, setting the stage for an epic confrontation.