The Conquest of Uttu Prime was a military campaign led by the Nemesor Zahndrekh of the Necron Sautekh Dynasty against the Imperial world of Uttu Prime in the Vidar Sector in the late 41st Millennium. Despite the intervention of a force of Space Marines drawn from the Imperial Fists Chapter, the world was lost to the Necrons and was integrated into the personal domain of Zahndrekh within the larger Sautekh Dynasty.