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Kossolax the Foresworn is a notorious Chaos Lord of the World Eaters. He leads a warband known as The Foresworn, a sizeable force of Khorne Berzerkers.[1][2][4] By M42, he had become powerful enough to appoint himself lord regent of the entire World Eaters Legion.[6]


Kossolax was originally Sergeant of the World Eater's 3rd Assault Company known as Solax. He had been trained on Bodt, took part in the Ghenna Massacre, and then betrayed his brothers at Isstvan III. An unremarkable officer who never rose particularly high, Kossolax survived the Heresy all the way to the Siege of Terra. However following Angron's defeat to Sanguinius and the death of Horus, the traitor invasion of Terra broke. It was then that Solax's Captain, Shâhka, abandoned his brothers and retreated from orbit with the Conqueror. Kossolax led his brothers in a desperate retreat and never forgave Shâhka for the betrayal.[6d]

Kossolax's origin as Sergeant Solax in Imperial histories largely based on sightings of the Barbarus, a Rhino transporter which belonged to Solax's squad and was reportedly present during the Siege of the Imperial Palace at the height of the Heresy. Since then, the Barbarus has been spotted on numerous occasions throughout the millennia in service of Kossolax.[1]

Following the Siege, Solar emerged as Acting-Captain of the 3rd Company and commander of the Furious Aggression. After discovering the world Skalathrax, Solax opposed the Devourer Goghur's desire to attack the Emperor's Children, warning that he would lead the 3rd Company at the first sign of aggression by Goghur.[7a] Solax was later part of Kharn's deputation that met with the Emperor's Children.[7b]

Eventually, he became a powerful Chaos Lord in his own right thought like Abaddon believed himself able to resist madness and full corruption by Chaos.[6d]

The First War for Armageddon

In 444.M41, Kossolax joined Angron in the First War for Armageddon. At that time, Kossolax's veteran warriors had already proven themselves in eight campaigns against the Imperium of Man.[4]

Though the forces of Khorne overwhelmed the planet and caused a bloodbath, their hold was ultimately broken. Angron and his Daemonic minions were banished and the warriors of Khorne repelled. During their withdrawal a part of the Foresworn warband was left back on Armageddon.[4]

The 13th Black Crusade

After the destruction of Cadia, Kossolax led the Conqueror at the head of a large Chaos fleet that included World Eaters, Night Lords, Death Guard, Thousand Sons, and Black Legion to attack Agripinaa.[5] This operation was part of the 13th Black Crusade of Abaddon the Despoiler. Kossolax's forces landed on Agripinaa, where they were confronted by the Blood Angels led by the Sanguinary High Priest Numitor. In order to turn the tide of the battle, he ordered his berzerkers to fall upon their allied cultist hordes. The massacre that ensued was enough to summon a mighty Bloodthirster who dealt heavy losses to the Blood Angels and their Death Company. Although they managed to overcome the daemon and drive the World Eaters from the planet, Kossolax was not slain. Seeking vengeance, Numitor vowed that he would hunt him down, no matter the cost.[3]

Era Indomitus

Following the destruction of Cadia, Kossolax's power grew even greater as massive numbers of World Eaters and other assorted traitors joined his forces. Declaring himself the Lord Regent of his former Legion, his grand ambitions were seemingly thwarted when Angron himself manifested aboard the Conqueror and the vessel's combative Machine Spirit that had once been Lotara Sarrin pledged itself to the Daemon Prince.[6a] Initially driven to rage and despair, Kossolax instead began to see the bestial Primarch as an opportunity to fully place the World Eaters under his command. Showing little interest in leadership, Angron instead would dwell in the bowels of the Conqueror until unleashed to murder a world. Kossolax used the Primarch's return to greatly swell his numbers.[6b]

However, with the Conqueror still under Angron's loose control due to its Machine Spirit, the vessel was drawn towards a Grey Knights trap on Hydaes as The Foresworn led a massive invasion. During the battle the Grey Knights set off a psychic beacon the decimated the planet and much of Kossolax's army, though the Chaos Lord himself and several of his lieutenants escaped back aboard the Conqueror with teleportation.[6c]


Kossolax is referred to as Kosolax in Codex: Eye of Terror (3rd Edition).[2]

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