Ss'll Sh'Karr
Ss'll Sh'Karr was a powerful Daemon Prince of Khorne who twice led his forces on bloody massacres on the Daemon World of Torvendis.
Sh'Karr was the size of a small Titan and had machinery and gears coming out of his chest. He had grey skin, an equine head with many eyes and great leathery wings, like many servants of Khorne his favoured weapon was a great axe. In the Daemon World novel we see his original skull in the possession of Lady Charybdia who keeps it as a trophy, but even the loss of his skull was not enough to stop Sh'Karr, who fashioned himself a new one out of brass and gears.
Sh'Karr's first reign of terror lasted for hundreds of years and Torvendis became a literal ocean of blood. He was defeated by unknown means and imprisoned in a shrine, until he was released by the disguised Arguleon Veq.
Once freed he was attracted to the battle between Lady Charybdia and the tribes of the Canis mountains, once he arrived he aligned himself with Golgoth and his barbarian horde so that they might destroy the followers of Slaanesh. Together they destroyed Chraybdia's city and Sh'Karr personally killed Commander Demetrius, a Chaos Dreadnought of the Violators chapter. Sh'Karr eventually turned on Golgoth and slaughtered his army, he continued butchering the survivors of both the barbarian horde and Charybdia's army until he was swallowed up by the reawakening of The Last.
Sh'Karr could summon daemons, which appeared to be smaller versions of himself. His mere presence would evoke bloodlust in friend and foe, and he could command the underground lakes of blood on Torvendis to do his bidding.