Orcus

Demon lord, originally one of the Old Gods.
At the Godmoot, Orcus sided with Eyal and the faction that wanted to grant the newly created lesser races immortality. However, this was a deception. Orcus was actually a follower of Ema's faction who wanted to give the lesser races the Gift of Death.
By insinuating himself into Eyal's confidence, Orcus was able to steal the secret of immortality. He then corrupted it into Undeath and created the first Undead. Among the more powerful of Orcus's Undead followers were the Vampires. Many more Undead fought on the side of the Demons in the The First GodsWar.