This further details the creature to whom the wings belong. She was a mutated genetic experiment, tall as a house, who was intended as a terrorist tactic but for one flaw: she retained her own mind, and wouldn't do what they told her to. So now they keep her locked in a giant basement and use her as an object of fear; any of their clients cross them, they throw the guilty man into her room and she puts on the 'giant scary monster' act. And it was effective every time but for once, wich I will detail later . . .