In the twisted vaults of Paradise, humanity fights for its survival. The savage alien warriors of the Combined Army have passed through the Gate of Acheron, descending into the lush jungles of the new colonial world in a seemingly unstoppable flow. The ferocious Morats pound the facade of Paradise, where brave men and women fight relentlessly to maintain a defensive line that the cunning Shasvastii infiltrate with devastating ease. In the stars above the skies, the concentrated power of humanity's fleets maintains a life-or-death blockade to cut off any endless horde of alien reinforcements. And if any of humanity's scattered forces retreat, then all may be lost...