"The restless dead, mostly," Ray says. "Those who died long ago but refuse to go on, and hang around making the lives of the living miserable. Demons, sometimes, though not very often. Spirits of things like disease or rage or destruction, who were never really born but who want the world of the living for their own anyway and'll do anything they see fit in order to get it."

He thinks for a minute, then decides that Cthulhu, Gozer and their ilk have already been described in that last.

"I have no quarrel with most of the spirit world," he says. "All I want, really, is to understand it better. I make my living helping to protect the city I live in from the spirits that'd see it destroyed or conquered."