A Harpy is a flying enemy that spawn at high altitudes, typically around Floating Island heights. In Pre-Hardmode, they won't spawn on the horizontal middle of the map, around an area equal to one tenth of its complete length. This restriction is removed in Hardmode. They use the Bat AI, and fire Harpy Feather projectiles (Harpy Feather.png). Harpies can spawn at any time, day or night. Up to seven Harpies can exist on screen during the day, ten at night, and fifteen during a Blood Moon.