It is the dawn of the fourth millennium. The Endless War, sparked by the death of humanity's Golden Age, rages on. Towering over the battlefields of the Human Sphere are the lumbering, fusion-powered titans of armour and weapons known as BattleMechs. Weighing anywhere from 20 to 100 tons, each Mech carries enough firepower to level a city block in minutes. But they are not alone, for Abominations, vicious hybrid monsters of flesh and steel, also lurk beneath the ash-choked skies of the worlds they fight to claim.