The year is 2284, and the Earth is but a distant memory. Due to the draining of natural resources and destruction of the environment, people soon realized that they had two options: flee Earth, or perish. Nearly everybody capable of helping chipped in as much as they were able, to fund research in space exploration. Be it by sheer luck, or by the act of a god, this research had resulted in finding many habitable planets, just in time for staying on Earth to be impossible. Unfortunately, even after the death of the planet, people stuck to their guns, and tried to impose their ideals on one another, resulting in an intergalactic war that can only end when one side irradicates the opposition.

After their defeat at Hoover Dam, the Legion is getting desperate. A large amount of resources were poured into that attack, and the losses were atrocious. With Lanius and Caesar both gone, there's only one hope left for the Legion: Legate Sustinere. A brash and irritable man, Sustinere is just what the Legion needs. Somebody who's aggressiveness is just as powerful as the Legion's desperation. In one last attempt to unifie their forces and regroup, the Legion must attempt to take a different pre-war city: Denver. However, with untapped water reserves and pre war weaponry held up in the old city, as well as plenty of tall and relatively undamaged buildings that would let them spot attackers from miles away, the Legion weren't the only ones after the city. Now, at the peak of their power, the bear has turned its gaze to the horizon, and want the same thing the Legion does. All the while, a long forgotten force grows ever more powerful, ready to lash out against both armies.

The world has been torn apart by war, and, just like any conflict throughout history, the Assassins and Templars are involved.