Mercury

Mercury (Hermes in Greek mythology) is a Roman god and is chiefly the messenger of all the other Gods of Olympus. He appears as the desk clerk of the hotel in which the other pagan gods gather to discuss the Apocalypse and is ultimately the one that betrays their location (and thus the location of the Winchesters) to Lucifer, resulting in his murder by the Devil alongside nearly all the other pagan gods, save for Kali and the Winchesters, who are saved by the Archangel Gabriel.