Sacrifice and Heroism

The narrator's willingness to risk his life and soul to save Naani, and the collective sacrifices of the Pyramid's inhabitants (e.g., unleashing the Earth-Current), underscore a theme of heroic selflessness in the face of overwhelming odds.

Mirdath sacrifices herself to save the narrator from a mad hound, and he heroically saves her life in return.

The Ten Thousand risk their lives to save the youths and retrieve their souls; the youths themselves make a foolish but heroic attempt to rescue the Lesser Redoubt.

The narrator undergoes the Full Preparation and departs alone into the deadly Night Land, a heroic sacrifice for love.

The narrator's departure into the dangerous Night Land to rescue Naani is an act of heroic sacrifice, leaving the safety of home behind.