Xenofex, sometimes referred to as Zenofex, is the leader of the Kreegans.
On the night that Xenofex was slain, he appeared to Lucifer Kreegan in a dream. He revealed which artifacts he would need to gather in order to construct Armageddon's Blade, and also showed him Khazandar, the smith who could forge it. He then showed him the effects of the blade:
"In an instant, a flash of white blinded me. My vision returned in time to see the blade conjure an ocean of fire to wash over the world. These waves of fire spread, fast as lightning, burning all in its path. When it was over, Xenofex and I stood face to face, on a world charred black. Examining the face of Xenofex, I saw only satisfaction and glee." — Lucifer Kreegan
Lucifer sent Xeron out to construct the blade, which led to the start of the Demon Wars.