The Legio Mortis, the Death's Heads, was among the first and greatest of the Titan Legions to cast its lot with the Warmaster, and its treachery struck a blow to the loyalist cause from which the Collegia Titanica never wholly recovered. An order of vast antiquity and strength, Mortis had close ties to the traitor faction of the Mechanicum and to Horus himself, and when the rebellion came it committed its god-engines wholeheartedly to the destruction of the Emperor's realm. Its Titans went to war in a livery of bone-white and black, their carapaces bearing the death's head sigil that gave the Legio its name, a promise of the annihilation they carried to every field. Mortis fought with a cold, remorseless efficiency, its Princeps embracing the corruption that crept into the traitor Legios as their machine-spirits soured and darkened in service to a damned cause. The Death's Heads were present at the war's greatest slaughters, their engines duelling loyalist god-machines amid the ruin of shattered worlds, and at the Titandeath of Beta-Garmon they were among the deadliest of the Warmaster's Titan hosts. To behold the bone-white engines of Mortis striding through the smoke was to know that a Legion of god-machines had come not to conquer a world but to end it.
Legio Titanicus
Order of battle
The Legio Mortis field the units of the Legio Titanicus — a detachment from the roster:
Kindred formations
Other Legio Titanicus formations
Legio IgnatumThe Fire Wasps, an ancient and honoured loyalist Titan Legion of Mars whose devotion to the Emperor never wavered through the long night of the Heresy.
Legio VulpaThe Death Stalkers, a traitor Titan Legion infamous even among rebels for a savage, predatory aggression that flung their god-engines recklessly upon the foe.