Mortarion is one of the twenty primarchs, the gene-forged sons of the Emperor. He led the Death Guard Legion during the Great Crusade, then turned on his father during the Horus Heresy and became a daemon prince of Nurgle. Today he’s known as the Death Lord, the Pale King, or the Reaper of Men, and he’s one of Chaos’s most dangerous champions.
Origins on Barbarus
Mortarion’s earliest years are known almost entirely from the Stygian Scrolls of Lackland Thorn, a historian attached to the explorator fleet that found his homeworld. He crash-landed on Barbarus as an infant, a toxic world wrapped in poisonous fog. The humans there lived in the lowlands, choking on the fumes, while cruel warlords ruled from the mountains above.
One of those warlords, a powerful sorcerer named Necare, found the child and raised him as his own. Mortarion grew fast and strong, and he turned against his adoptive father, leading a rebellion to free the humans of Barbarus. When the Emperor arrived, Mortarion joined him, but he never forgot the world that shaped him.
The Death Guard and the Great Crusade
The Emperor gave Mortarion command of the XIV Legion, which became the Death Guard. They were grim, relentless, and built to endure the worst battlefields the galaxy could offer. Mortarion’s own bitterness about psykers and his father’s secrets simmered under the surface.
During the Great Crusade, the Death Guard earned a reputation for never backing down, even when the odds were hopeless. But Mortarion’s resentment toward the Emperor and his distrust of the warp left him vulnerable to Horus’s lies.
The Horus Heresy and the fall to Nurgle
When Horus turned against the Emperor, Mortarion joined him. But the Death Guard’s fate was sealed in the warp, where a plague god waited. Nurgle, the Chaos god of decay, offered Mortarion a bargain: serve him and his sons would survive their suffering. Mortarion accepted, and the Legion was reborn as plague marines.
He became a daemon primarch, a towering embodiment of pestilence and despair. At the Siege of Terra he fought for Horus, and after the Heresy he retreated into the warp, ruling his own domain called the Realm of the Reaper.
Mortarion in the 41st millennium
Mortarion is still active, leading the Death Guard from his daemon world and spreading Nurgle’s gifts across the galaxy. He’s a monstrous figure, winged and rotting, carrying a massive scythe called Silence. He’s one of the few primarchs to have returned in the modern era, clashing with Imperial forces and even his own brothers.
His story is a tragedy of pride and endurance twisted into something monstrous. He wanted to save his sons from suffering, but he traded their humanity for an eternity of decay.
Key facts
- Mortarion is the primarch of the Death Guard, the XIV Legion.
- He was found on the toxic world of Barbarus and raised by the warlord Necare.
- He turned to Chaos during the Horus Heresy and became a daemon prince of Nurgle.
- He’s also known as the Death Lord, the Pale King, and the Reaper of Men.
- He rules the Realm of the Reaper in the warp and remains active in the 41st millennium.
FAQ
Who is Mortarion?
Mortarion is a primarch of the Death Guard Legion who became a daemon prince of Nurgle after betraying the Emperor during the Horus Heresy. He’s known as the Death Lord, the Pale King, and the Reaper of Men.
What happened to Mortarion?
He turned to Chaos during the Heresy and was transformed into a daemon primarch by Nurgle. He now rules the Realm of the Reaper in the warp and leads the Death Guard in the 41st millennium.
Why did Mortarion join Horus?
Mortarion resented the Emperor and distrusted psykers, and Horus exploited that bitterness. When his Legion was struck by a warp plague, Nurgle offered salvation in exchange for servitude, and Mortarion accepted.