The Ruul are on the run. Operation Atlas was nearly entirely successful. The RIZ is on the brink of collapse. The Ruulan Armada has been largely defeated. The Ruulan tribes are disintegrating and divided. The Coalition is advancing on all fronts, inflicting devastating losses on the invaders at every opportunity. However, the war is not yet over. A bitter note tarnishes the triumph. Kerrelak, the War Master of the Ruul and the supreme military leader of the tribes, managed to escape the slaughter among his people. Driven by an insatiable thirst for revenge, he gathers a fleet of survivors and sets course for the homeworld of his most hated enemies and the architects of the Ruulan defeat: Earth. Yet, due to the high personnel and material demands of Operation Atlas, only a few ships and troops are available for defense in the Sol system. A relentless defensive battle is looming, and in the end, only one side will survive...