The Keryx (Greek for "Herald") is the Watcher Within. He is represented by the god-form Anoup empeIebet (Anubis of the East), and is the counterpart of the Phylax, the Watcher Without. His station is within the portal of the Hall, and his duties are to see that the furniture of the Hall is properly arranged at the Opening, to guard the inner side of the portal, to admit the Fratres and Sorores, to watch over the reception of the Candidate, and to make all reports and announcements. He is also charged with leading all Mystic Circumambulations with the Ever-burning Lamp of the Guardian of the Mysteries. He wears a black collar with a lamen depicting a white Caduceus on a black background, and carries the Red Lamp, symbolic of the Hidden Knowledge, and the Caduceus Wand, symbolic of its directing power.
The feminine form of Keryx is Kerykissa, but Keryx is often used in practice for both sexes.