The greatest star realm the Inner Sphere has ever seen, the Federated Commonwealth, has collapsed into a brutal civil war. Sporadic but vicious fighting breaks out across their worlds as militia units, house regiments and elite forces declare for either Katrina Steiner or her brother, Victor Steiner-Davion. Brother battles brother and worlds burn in combat as for the first time in centuries, inner sphere warships clash over worlds contested by regiments of battlemechs. Into this furnace of war steps your force: Whether loyal to the dying dream of the Federated Commonwealth, declaring for one of its fighting heirs, or simply out to make money from desperate local commanders, its time to prove your worth in one of the most fearsome wars of the Inner Sphere, often fought through its cities and streets.

You have 20,000 Battle Value (BV) to spend on Mechs, vehicles and battle armour. See link for more details.