Harpuia is the fourth stratum boss of Etrian Odyssey II: Heroes of Lagaard and its remake. She is fought at 20F (An Eternal Winged War). This beautiful, winged creature is an old enemy of the Birdfolk, preying upon their race since the old times. In order to open the way to the Heavenly Keep, the folk leader, Kanaan, asks the heroes to slay his kin's nemesis.