Keraz
Keraz the Violator was a Khorne-worshiping Chaos Space Marine who was part of a large Chaos Undivided warhost[1a] that rampaged across the Eastern Fringes of the Ultima Segmentum. The warhost toppled a dozen systems and murdered a hundred planets, as they spread the worship of Chaos throughout the Segmentum, as no force was able to stop them. The warhost would eventually land on Dolumar IV, a backwater planet with a small human colony which they subsequently destroyed. There the warband would have a Chaos temple built, where they summoned the Lord of Change Tarkh'ax, who would begin to lead them on a new Black Crusade to strike at Holy Terra. It would be all for naught however, as after the summoning an Eldar strikeforce would attack and seal the warhost in a prison; in a cut off path of the Webway.[1b]
Keraz and the warhost would stay in their prison for three thousand years, until the heretic Meyloch Severus, Planetary Governor of the now resettled Dolumar IV, completed a Chaos ritual that broke the warhost's prison and allowed them to materialize on the Imperial Navy vessel the Enduring Blade. With one swipe of his axe he beheaded the Tau diplomat El’Yis’ten, as the Tau and Imperium were amidst of peace talks and would have killed more had Severus not stayed his hand. Compelled to obey him because of the ritual, Keraz grabbed the Ethereal Ko'vash and Lord Admiral Benedil Constantine and followed Severus into a portal[1a]; that transported them to the temple the warhost had built millennia earlier.[1b]
There Severus would begin the ritual that would free Tarkh'ax, the warhost's leader, and grant him the power he craved. As he was conducting the ritual the Imperium and Tau Empire would launch their forces onto Dolumar IV, to stop the Chaos threat that had engulfed the planet[1b]. In order to buy himself more time, Severus ordered Keraz to guard the Plague Marine Siphistus as he corrupted the Imperial Titan Imperio Prince-Nebulae Draconis, to use against the forces attacking them. Keraz would guard the control room of the Titan, with several Plague Marines as Siphistus completely corrupted it. Now called the Machina Dragon-Bile, the Titan was in the process of activating when the Fire Warrior La'Kais burst into the control room, having fought his way through the forces guarding the Titan, in order to destroy it. Keraz and the Plague Marines attacked the Fire Warrior, but La'Kais managed to avoid their attacks to Keraz's dismay. In a rage he lost control and began swinging indiscriminately at the Fire Warrior, in his need to spill blood. When regained himself, Keraz realized he had killed the other Chaos Space Marines guarding the control room, leaving only Siphistus, strapped in the still activating Titan, alive. At that moment La'Kais, unharmed during Keraz's rampage, emerged and fired at him, killing him instantly. As he died, Khorne devoured Keraz's soul for his failure.[1c]