90482 Orcus Etruscan equivalent of the Roman Pluto, and later became an alternate name for Pluto. The surface of Orcus is relatively bright with albedo reaching 23%, grey in color and water-rich. The ice is predominantly in crystalline form, which may be related to past cryovolcanic activity. Other compounds like methane or ammonia may also be present. The existence of a satellite allowed astronomers to determine the mass of the system, which is approximately equal to that of the Saturnian moon Tethys. The ratio of masses of Orcus and Vanth is uncertain, possibly anywhere from 1:33 to 1:12. The diameter of Orcus
Orcus (Dungeons & Dragons) Orcus's remaining forces will begin their siege on Lemoriax. Orcus is ultimately defeated in his battle against Demogorgon and retreats to Thanatos to heal, but the battle has helped to weaken Demogorgon, and Orcus will return to Gaping Maw shortly thereafter and remain hidden. If Demogorgon is slain, Orcus will have a chance to claim the title of Prince of Demons, and whether or not he is successful he will claim Lemoriax. The fourth edition "Monster Manual" names the Raven Queen as a god whom Orcus particularly wants to destroy, as he hungers to usurp her control over death and