An epithet sometimes associated with Nyarlathotep. When Doctor Stugatche's excavation crew found the top of a statue of Nyarlathotep, they began to speak among themselves of the Demon Messenger. [RBFaceless]
The Demon Messenger was also mentioned in a papyrus from the excavation of the Ninth Pyramid. [RBOpener]
The Dark One is also known as the Demon Messenger. [RBDemon]