Fallen angels can be split into two main groups namely: The angels who sided and allied with Lucifer during the war in Heaven and the fallen Watchers or Grigori.
These mysterious angels, gentle Grigori were created by God to be Earthly shepherds of the first humans. The Grigori were both physically and spiritually gigantic. Serving early humanity as vast reservoirs of information concerning the finer points of civilization, and their selflessness was beyond compare. They were also called the Watchers, as it was their job to observe humanity, lending a helping hand when necessary but not interfering in the course of human development.
The Watchers are acutely attuned and hear disturbances that no one else can. If a demon assaults a human in his dreams, a Watcher can hear it. If an angel makes a baby cry, a Watcher can hear it. Most celestials can't hear those sorts of subtle disturbances, amidst all the other celestial noise, but the Grigori can.
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