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) 4th Edition for Dummies" describes Orcus as "the most monstrous evil in the game". Orcus was first presented in the "Eldritch Wizardry" supplement in 1976, by Gary Gygax and Brian Blume, for the original (white box) "Dungeons & Dragons" game. Although the book states that there are several such demon Princes, only Orcus and Demogorgon are detailed, "two of the greatest of these exceptional demon lords". Game statistics for Orcus appear on page 27, while a description of Orcus appears on page 35 with an accompanying illustration, and a description for his "Wand of Orcus" appears on page 42 under