The cult of Orcus was mainly composed of twisted creatures with a morbid fascination with the undead, such as necromancers, as well as creatures deliberately seeking the path to unlife, such as would-be liches and vampires.
The following beings were some of Orcus's most infamous servants: Banak, high priest of Orcus
Zhengyi, the Witch-King of Vaasa.
Kyuss, high priest of Orcus.
Orcus' realm was Thanatos, the 113th layer of the Abyss. It was a frigid and frozen layer infested with the undead. Several cities dotted the layer (most of them ruled by minions of Orcus, including a powerful succubus and Quah-Nomag himself). Orcus ruled from his palace of Everlost in the bone-meal desert of Oblivion's End, north of a vast mountain chain called the Final Hills that cut across the layer. Despite Orcus regaining control over Thanatos, Kiaransalee's taint could still be found in the city of Naratyr on the Frozen Sea south of the layer, and in the so-called Forbidden Citadel in the city of Lachrymosa, located in the Final Hills.