The Machine Spirit guards the knowledge of the Ancients

The Dark Mechanicus is a sect of Tech-priests and members of the Titan Legions of the Adeptus Mechanicus who swore their loyalty to the Warmaster Horus and the Chaos Gods as the Great Crusade came to a close and the terrible civil war of the Horus Heresy began in the early 31st Millennium. Horus won over the loyalty of many of the Mechanicus' Adepts after promising them the lost secrets of ancient Standard Template Construct (STC) technology that had been recovered from the worlds of the recently subjugated Auretian Technocracy by the Sons of Horus Legion. The members of what became known as the Dark Mechanicus supported Horus during the start of the Horus Heresy and they participated in the attacks against the Loyalist Space Marine Legions on Istvaan V where they used dark and forbidden knowledge to help destroy the Loyalist forces. Later, the Dark Mechanicus, led by the Fabricator-General of Mars Kelbor-Hal, unleashed the terrible civil war upon the Mechanicus known as the Schism of Mars in a bid to restore the autonomy of the Mechanicus from the Imperium of Man. This effort failed when Horus was slain at the end of the Horus Heresy during the Battle of Terra and the Loyalist elements of the Mechanicus succeeded in driving their Chaos-corrupted brethren from the Red Planet. Many of these so-called Hereteks of the Dark Mechanicus fled into the Eye of Terror alongside the other Traitors after the Great Scouring, when the Imperium recovered most of the territory across the galaxy that had been lost to Horus' Traitor forces.

Ranks :

Fabricator General
Magos (Magos Explorator and Magos Errant)
Genetor
Logis
Artisan
Enginseers
Skitarii
Menials
Servitors
Collegia Titanicus Princeps
Moderati
Tactical Officer
Techmarine


Traitor Titan Legions

Burning Stars
Death Stalkers
Fire Masters
Iron Skulls
Legio Argentum
Legio Damnatus (Warped Dogs)
Legio Damnosus (Lords of Rain)
Legio Lacrymea (Harbingers of Grief)
Legio Magna (Flaming Skulls)
Legio Mortis (Deaths Heads)
Legio Tempestor (Storm Lords)
Legio Vulcanum I (The Dark Fire)
Legio Vulcanum II
Legio Vulturum
Tiger Eyes