Duke Orcus the Necromancer was the commander of the Third Legion in the army of Zaros, and one of the twelve Chthonian dukes given to Zaros by Hostilius. Duke Orcus was known to be a necromancer. Nechryael are the spawn of Duke Orcus.
- Orcus features in Mod Jack's comic The Empty Throne as being present during Zamorak's betrayal. He is depicted as a very tall, concealed creature.
- Orcus translates to "death" or "underworld" in Latin, the real-world language from which the infernal language is derived. In Roman mythology, Orcus was the god of the Underworld.
- Mod Jack suggested on Twitter that Nechryael are the spawn of Duke Orcus.