Welcome to the dark nightmare future of the 41st Millennium, the grim era of the Imperium. War is spread across a thousand different worlds. Powerful armies of Space Marines, Imperial Guardsmen and Tau warriors are in constant conflict, unleashing carnage via deadly war machines, crushing artillery, and vast starships. Warhammer 40,000: Fire Warrior follows one day in the tumultuous life of Kais, a young Tau warrior who must battle alone against a force that shows no mercy: The Imperium. Kais will soon learn there is a darker foe at hand and becomes entangled in a frightening story that leads him the darkest battle yet of the ongoing war.