Howling:What IS the Nightmare Child?

Because the Nightmare Child was mentioned yet again in The End of Time, it raises the question: what is it? But this time the Doctor appeared a bit more... frightenved when mentioning it. He spoke of it as if it was one of the biggest, baddest, mnost evil things out there. Even its name really creeps me out, sounds pretty weird/creepy/sinister, in my opinion.

By what it is, I mean by what form is it? Is it an entity, a monster, something else? The Doctor had always described it as something not nice at all. But the name is damn creepy. Delton Menace 17:12, January 2, 2010 (UTC)