Horus Heresey Stgyies VI Insurrection

The Legio Vulcanum was originally founded sometime before the Horus Heresy on the Forge World of Stygies VIII, near the Eye of Terror. Stygies VIII was rare in that it hosted two Titan Legions, Legio Vulcanum I and II, often known by their respective Low Gothic names as the Dark Fire and the Lords of Ruin. The command structures of both Legio were interlinked, and their Princeps were cloned from the twin Legio's greatest heroes. Most of both of the legions machine's were on Crusade with Horus when the Heresy began, immediately joining him. The two Legions launched an attack on Stygies VIII in cooperation with Chaos Cultists but on the verge of total victory were defeated by Eldar forces from Saim-Hann, which suddenly appeared to deny Chaos a new staging point. The loyalist mechanicus forces was all but wiped out sacrificing to save the last temple of knowledge on the forge world.