They were forged for Mankind's darkest hour -- and that hour is upon us. Ultramarines Primarch Roboute Guilliman, Lord Commander of the Imperium The Primaris Space Marines are a new breed of transhuman warriors developed across the span of ten thousand standard years by Archmagos Dominus Belisarius Cawl. Their creation was initiated on Mars on the order of Primarch Roboute Guilliman in the days immediately after the Second Founding in the early 31st Millennium. Cawl used the genetic template of
