Kyroksh is the lord of battle, a Demon God of chaos and destruction. His invisible presence stalks battlefields, inciting bloodshed and meyhem wherever he treads. Those who seek the favor of the Destroyer try to impress him with their capacity for brutality, and by delving into the utter depths of depravity. No corruption of the flesh is beneath the interest of the Destroyer, and the more twisted or abominable these are, the better pleased he is. In the end, Kyroksh is said to prefer exquisite pain and a slow, horrible death to a quick, clean one, but it is the carnage of warfare that he loves the most. Ancient bindings prevent Kyroksh from having free reign on the mortal plane, and these are bonds he is eager to destroy.

Kyroksh appears as an unremarkable man, quite normal in all respects, save for the unholy flickers of flame in his eyes. Many myths tell of an unassuming warrior who came out of nowhere to offer good seeming advice and a skillful sword during a military campaign, yet later proved to be none other than Kyroksh himself. Often, the people whom Kyroksh assisted did indeed win their wars in the end, but only after terrible losses on all sides. The name of Kyroksh is spoken with fear or fanatical devotion: no one is ambivalent in their opinions of him. Although the Imperial armies have benefited from his power on more than one occasion, his worship is technically outlawed in the Empire. The corrupt generals and commanders of the Imperium will usually ignore this law, if the worship of Kyroksh can win them a victory.

It is said that once Kyroksh was betrayed by his most trusted assistant, a Demon Prince whose viciousness was only surpassed by his master's. The nature of this tale is twisted by many ages of retelling in the mouths of those who wish to either glorify the Demon God or turn the legend into a lesson in morality.