Today’s lore is all about the undisputed Lord of Death, Mortarion. Come and learn about this Primarch from infancy to heresy!
The Primarch of the Death Guard wasn’t always a slimy rotting murder corpse! He once had someone to care for him and teach him. Let’s find out more!
Via: Lexicanum
The only consistent information regarding Mortarion and his homeworld come from a single source, the Stygian Scrolls of Lackland Thorn; a historian and polymath attached to the explorator fleet that discovered Barbarus.

The winner of the battle in which Mortarion landed was the greatest of the warlords. He reveled in his victory until the silence was shattered by the scream of a child. It is said this warlord walked the battlefield for a day searching for the child, not stopping until he found it. For a moment he considered killing the child, but he realized that no human should be able to breathe at this height, let alone cry out. He considered what he had found, and then bundled the child up and carried it from the carnage. He now had a son, something he had craved for years despite his dark magical powers. The warlord christened the child Mortarion, child of death.

He taught everything of warfare to Mortarion. He was constantly at the front fighting against all of the other warlords’ armies, sometimes of undead humans, sometimes of more daemonic creatures. Mortarion was still human though, and he sought to know of those who dwelled below the layer of fog. Eventually, Mortarion escaped from his holdings and descended the mountain, the warlord bellowing after him of his treachery, and that to return would mean death.
As Mortarion descended, he began to realize he had found his people. He smelled food for the first time, he saw people unobstructed by the fog and for the first time, he heard laughter, real laughter, not that of the victorious warlord’s. He realized that the prey that the warlords fought over was his own people, and with this came a sense of hatred and he vowed to give them justice over their oppressors.

A lesser warlord arrived with his shambling undead legions and began carrying off those they could for their master’s plans. The peasants fought back as best they could, but they only had fire torches and farming implements to defend themselves. Each of them had fought many times like this during their lives and it was all they could do not to run, let alone put up an effective counter maneuver.
Until that is, Mortarion himself joined into the fray. He strode above his fellow humans, dwarfing all around him. He used an enormous two-handed scythe and charged into the ranks of the enemy with the hatred that had been building for years before and drove them from the village. The warlord smiled and withdrew to the poisonous area above, unaware of the primarch’s amazing respiratory abilities. Mortarion dispatched the warlord and his place among the villagers was sealed.
As Mortarion grew he taught the villagers all he knew of warfare. Word of his knowledge and exploits spread and people came from far and wide to learn from him. Soon, villages were becoming strongholds and the villagers were more effective defenders. Eventually, Mortarion began to move from village to village, teaching along the way and if need be, defend the settlements. His ultimate vengeance was always denied to him because of the fog that prevented the humans from pushing home their attacks. Mortarion then recruited the strongest and most resilient of warriors from the villages he went to.
Mortarion, leading his Death Guard, as they had become known, followed them into the fog above, massacring the remaining forces and killing the warlord. For the first time in history, Mortarion had led the people into the toxic fog and survived. Mortarion continued to improve the breathing apparatus and campaigned ever higher into the fog. The constant exposure to the toxins hardened his warriors, a useful and transferable skill retained by the Death Guard.

