During the Age of the Sorcerer, Humans began their intensive study of arcane lore and its ties to the land itself. The majority of the schools of magic that are practiced today were first discovered during this era. Certain schools, especially those that dealt with mental domination and necromancy, were forbidden from use in Human society. A cadre of Human sorcerers and necromancers who sought power through these forbidden schools of magic posed a threat to Human society at large, and they were summarily exiled from Human culture. This exile was not a gentle one, and wars raged between the two sides, culminating in the exiled embracing a new deity, Niatha Moraven, Goddess of Vengeance and Power. With the power of a deity behind them, the exiled were able to resettle in the frigid lands of northern Aradoth, far from Human society. Niatha Moraven marked her new followers by making them strikingly beautiful, but in turn giving them bestial features such as horns and tails. To this day, the Fiends pay their fealty to Niatha Moraven, who they call the Mother of the Fiends.

Because the Fiends have sacrificed some of their physical gifts for mental ones, the Fiends excel in all fields of scholarly and arcane endeavor.