Orbos

Orbos was an ancient demon. Little is known about his life in the present day, but several historic sources discussing his life survived.

According to the Demonologist Lexicon, Orbos was among the first demons, committing terrible crimes before he did a right-about and was praised for his deeds.

His skull somehow got into the possession of the Order of the Eternal Fire.

He is presumably an ancestor of Sly, at least the two look mighty similar.