War has spread across the Inner Sphere, shattering and shifting alliances both old and new. As the Clans once more close in on humanitys homeworld of Terra, the walls of Fortress have come down, revealing the return of Devlin Stone. Desperate for any edge, the Great Houses, Clans, and Periphery states of the Inner Sphere have unleashed a flood of new war machines, rushing them into battle on every front.