The most obvious addition to the game is the all-new playable faction, the Imperial Guard, which, on the surface, may seem a bit mundane. However, the expansion is very much a product of player feedback--Relic has taken great care to listen to player comments and incorporate them into the new game. To that end, the new faction doesn't specialize in heavy melee like the orks, or in highly versatile units and tactics like the space marines, or in units with powerful special abilities, like the chaos marines, or in smaller armies with powerful units to micromanage, like the eldar. Instead, the Imperial Guard, also known as "the hammer of the emperor," focuses on attacking in numbers with powerful defensive bonuses. Maybe a squad of infantry with blaster rifles doesn't have quite the same visual flair as a gigantic red demon rising from the earth, but you'll forget your skepticism of these troops when a battalion of them chews up your entire front line while firing from cover without so much as breaking a sweat.