Deep Princess is the form Gutrune took, after allowing the Deep Ones blood to take over her. She is one of the three possible final bosses of Etrian Odyssey III: The Drowned City, and can only be fought on the Deep City route. Working under Seyfried's orders to slay the princess, in fear that the Deep Ones blood could take over her and destroy Armoroad in progress, the explorers defeat Kujura and manage to reach the Porcelain Forest's deepest area, where the princess rests. She then stops resisting and lets the monster's blood take over her, transforming her into this.