"BattleTech: Interstellar Operations
Scaling up to a level of play that allows for the conquering of entire factions, Interstellar Operations allows BattleTech players to scale between all the various rulebooks – from a single warrior to regiments on the march. Its Alternate Eras section details a slew of technologies across the centuries, such as the much-anticipated return of the Land-Air Mech with full rules for play and construction."