Sathariel was a dark angel in the service of the evil deity Asmodeus. His exact nature is unknown and, although he was described as a dark angel, he may in fact have been a devil. Alternatively, he could have been a fallen angel.
Sathariel had black feathers on his wings and his body was shrouded in darkness.
Sathariel lived in Waterdeep and oversaw the operations of the Vigilent Order. In 1480 DR, he attempted to complete the ritual of the First Flensing, a spell that would have opened a gate to the Prime Material Plane for Asmodeus' use. He was slain by the deva Jinnaoth Ir'Gadohn in 1480.