In 999.M37 Necrons entombed in the agri-world Arrizon awoke; their rising devastated the planet, burning much of the once-fertile world to desert. The Necrons then set out to slaughter all of Arrizon's populace. A half-breed mutant named Duran Anastasio scouted a path to the Pyramid and led a force of Rough Riders under Colonel Jennison of the 21st Kansaas to it; brushing aside scattered resistance from the surprised Necrons, they attacked the pyramid at daybreak.