The Legio Magna (Flaming Skulls) is a Traitor Titan Legion of the Dark Mechanicus that repudiated its oaths to the Emperor of Mankind and followed Warmaster Horus into the service of the Ruinous Powers during the Horus Heresy. There is very little information in Imperial records about this obscure Titan Legion, though it is suspected to have been founded before the Age of the Imperium, during the Age of Strife. The Legio Magna's homeworld was located in the Ultima Segmentum, where they hailed from the seventh planet of the Estaban System, the Forge World of Estaban VII. It is assumed that it was either destroyed at the end of the Heresy or was driven towards the Eye of Terror along with the rest of the Forces of Chaos. Its current whereabouts are unknown.