The Legio Xerxes was a Loyalist Titan Legion of the Collegia Titanica, one of the military arms of the Adeptus Mechanicus. There is very little information in Imperial records about this obscure Titan Legion, including when it was founded or from what world it hails. Ancient historical sources indicate that this Legion may have been based on Mars itself. During the Great Crusade the Legio Xerxes was attached to the service of the 670th Expeditionary Fleet. The Primarch Alpharius and a force from his XX Legion of Astartes, the Alpha Legion, fought with the 670th Expedition during the tragic campaign to bring the world of Nurth to Imperial Compliance, but never became an official part of the 670th's order of battle. Lord Commander Namitjira remained in formal command during the operation, th