Orcus

Orcus is a deity in ancient Roman religion, associated with the underworld and the punishment of oath-breakers. In some sources he is treated as an aspect of the realm of the dead, and later writers sometimes identify him with Pluto or Hades, though he remains distinct in earlier traditions. The name also appears in Latin poetry and inscriptions as a general reference to the underworld.

90482 Orcus is a Kuiper belt object discovered in 2004 by astronomers including Mike Brown. It is classified as a plutino, sharing Neptune’s 3:2 orbital resonance with Pluto. Orcus has a small moon named Vanth. The IAU named the object Orcus, drawing on the Roman god to emphasize its relation to Pluto.

In fantasy fiction and games, Orcus is a demon lord of undeath within the Dungeons & Dragons multiverse. He is typically portrayed as a powerful necromancer-king who commands legions of undead and opposes good-aligned forces. The name and concept have appeared in various editions and related media, contributing to a broader fantasy archetype of a necromantic antagonist.