Demon

A Demon or Daemon are malevolent creatures native to the Plane of Hell, varying in appearance but familiar in hostility. Originally, an army of Angels was cast out of Heaven and banished into Hell as punishment for their rebellion. These Fallen Angels, tainted by Lucifer's power and experiments, became the first Devils, known as the "Archdevils".

From there, more Devils and Demons populated the Plane until divisions could be made with each Archdevil on territory and governing of populace.