Arioch is one of the most powerful of the Dukes of Hell. He has many titles and nicknames including Knight of the Swords, Lord of the Higher Hell, and Lord of the Seven Darks.
Arioch is the patron of Melniboné and has a personal relationship with Elric, who was the first emperor to summon him to the plane of Earth in a long time. He is sophisticated and highly intelligent, though possibly insane, and he usually (but certainly not always) appears as a beautiful youth, usually with blond hair.
Arioch is one of the three Sword Rulers along with Xiombarg and Mabelode, and the first to be slain by Corum Jhaelen Irsei. He created the Mabden and had them wipe out his race, the Vadhagh, not out of malice but as a careless purge of the creations of the Lords of Law after winning the Fifteen Planes from them. Corum took his revenge against him by crushing Arioch's heart with the Hand of Kwll.
- Lord of the Higher Hell 
- Lord of the Seven Darks 
- Knight of the Swords 
- Keeper of the Two Black Swords 
- Arag the Great Old God 
- Michael Moorcock (1972, 1983), Elric of Melniboné, Berkley, p. 83
- Michael Moorcock (1972, 1983), Elric of Melniboné, Berkley, p. 170
- Michael Moorcock (1972, 1983), Elric of Melniboné, Berkley, p. 82
- Michael Moorcock (1971), The Knight of the Swords