During the Great Crusade the Legio Gladius was deployed in support of the 27th Expeditionary Fleet, under the command of the Raven Guard Legion, far to the galactic south. Most likely, this Legion was deployed from it's homeworld by the corrupted Warmaster Horus so that the Traitor Legions could more easily conquer Diamat and secure military materiel required to reinforce their position on the world of Istvaan V before the Drop Site Massacre. This obscure Titan Legion's current status is unknown.