The Nightingales were scareactors that appeared in the Halloween Horror Nights 21 haunted house, Nightingales: Blood Prey. These ancient shape-shifting creatures are banshees that prey on sick, dying or wounded warriors. They don't care who is evil, or who is good. As long as they feast on the weak warriors, they don't have to pick sides. During World War I, they took on the form of nurses in order to get closer to the soldiers.