"It's rumoured to be headquartered in one of the major hells, is that demonic enough for you? Watchers watch Slayers. I suppose you don't know what those are. The Slayer, at any given time, is the latest heir of a mystical package of superpowers primarily geared toward physical combat. It is her job to run around killing vampires and other evil things until one of them gets the drop on her and the next Slayer is called to take her place."