The Watchers are an obscure group of magic wielders who work for good and help where they can. “They are incredibly powerful, but seldom use their magic directly” (2:94). They rarely appear to people, let alone speak with them. Alex was an exception. On the rare occasions they appear to people, they give warnings. If someone ever receives advice from a Watcher, it is always heeded.
Almost nothing is known about them as of now.