The Legio Tempestor 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. One third of the fabled "Triad Ferrum Morgulus,": the Legio Tempestus (or Tempestor as some later accounts termed the Order) was founded alongside the Legio Mortis and Legio Ignatum in the distant Age of Strife on Mars. During the Great Crusade the Legio fought for decades at the leading edge of the Imperium's expansion alongside the most celebrated of the Legiones Astartes. Countless worlds were brought to Compliance and numerous xenos empires cast down for which the Legio became so well known, earning it the epithet "Stormlords." Later, however, the loyalties of the Legio Tempe