|Although this article is based on canonical information, the actual name of this subject is conjectural.|
Archduke Sebassis belonged to an unidentified demon species. These demons were extremely pale-skinned humanoids with yellow eyes, pointed ears, antelope-like horns and blueish blood. They were also blood-drinkers like vampires, although it was unclear if this was for sustenance or simply for pleasure.
The horns seemed to be a symbol of status among this species, as those of most of Sebassis's servants and bodyguards, save for Sebassis's aide Artode, had been cut. Their society had royal hierarchy system, and enslaved members of the same species.
According to Charles Gunn, they enjoyed blood-sports and killings during social events. This species also seemed enjoy hunting members of other demon clans for their skins, including the Deathwok Clan – Artode possessed a suit-jacket made of Deathwok skin.