The final battle of the war took place here, with Guilliman and Mortarion fighting each other to a standstill amongst the ruins of Iax. Eventually, Mortarian and the Death Guard were summoned back to the Scourge Stars, which had come under threat from the War in the Rift. They withdrew from Iax under the cover of a virus bomb and the forces of Nurgle retreated from Ultramar, but the threat of a renewed attack in the future remains. (Warzone Ultramar)