The Legio Vulpa is a Traitor Titan Legion of the Dark Mechanicum that repudiated its oaths to the Emperor of Mankind and followed the Warmaster Horus into the service of the Ruinous Powers during the Horus Heresy. The Legio Vulpa is known to have participated in the Istvaan III Atrocity that began the Horus Heresy, but Imperial records bear no mention of its further actions.
- Istvaan III Atrocity (ca. 007.M31) - The campaign known in later times as the Istvaan III Atrocity began when the Imperial Planetary Governor of Istvaan III, Vardus Praal, had been corrupted by the Chaos God Slaanesh whose cultists had long been active on that world. In 205.M31, Praal declared his world to be independent from the Imperium of Man. Unaware of the change in Horus' loyalties following his corruption by the Chaos Gods on the world of Davin, the Council of Terra charged the Warmaster with the retaking of that world, primarily its capital, the Choral City. When the Imperium finally gathered its forces, the Sons of Horus, Death Guard, Emperor's Children and the World Eaters Legions arrived in the Istvaan System, mustering in orbit above the doomed planet. Under the guise of putting down the rebellion against Imperial Compliance, Horus hatched the plan by which he would destroy all the remaining Loyalist elements of the Legions under his command. He purposely gathered those Astartes who were not loyal to him and used them in the assault on the non-Compliant world. With elements of the Legio Mortis, the Legio Audax and the Legio Vulpa Titan Legion in support, the invasion of Istvaan III then began in earnest. The Legio Vulpa undoubtedly played a part in the campaign, but sadly none of its exploits are currently present in Imperial records.
- Kitsune (Warhound-class Titan) - Fought with the Sons of Horus Traitor Legion during the Horus Heresy at the Battle of Molech.
- Kumiho (Warhound-class Titan) - Fought with the Sons of Horus Traitor Legion during the Horus Heresy at the Battle of Molech.
None listed in current Imperial records.
The God-Engines of Legio Vulpa march in rust brown with bone trim.
This Traitor Titan Legion's badge is not listed in current Imperial records.
- The Horus Heresy - Book One: Betrayal by Alan Bligh, pg. 40
- Vengeful Spirit (Novel) by Graham McNeill