YOUR SLAVERY TO THE FALSE EMPEROR ENDS TODAY.Chaos Rising is the first expansion pack to the Dawn of War II series that brings forth a fifth race into the game; the dark nihilistic forces of Chaos.
Story/Campaign:
For thousands of years the planet Aurelia has been caught in the Warp storm, untold horrors spawned upon its surface and made barren with ice. It should be a wasteland.
It isn't.
You and your squad of Space Marines will traverse across planets getting rid of the Chaos forces and others who stand in your way, while also being given various choices throughout missions and upgrades to your squad that will either drive your squads towards the corrupting influence of Chaos, or away from it and keeping true to your Space Marine beliefs.
tl;dr:
A stand-alone expansion pack for Dawn of War 2 that adds a new race for about $30 and a new campaign with cool stuff.
Note: Just like in the later stand-alone expansions for Dawn of War 1, you only require Dawn of War 1 to be able to play the original campaign in the Chaos Rising game itself and to play Tyranids, Eldar, Orks and Space Marines in Multiplayer/Last Stand.