The player is forced to change factions at certain points within missions and in later missions can change at will (that is, one can change from Eldar to Imperial guard and back, but not switch to Chaos or Ork). In the Disorder Campaign, the player leads Chaos and Ork forces. In the Order Campaign, the player leads the Imperial Guard and Eldar forces to awaken the Titan and defeat the Necrons.
The campaign is divided into two halves, the Order and Disorder campaigns. In addition to this, the Ork Warlord Gorgutz has chosen the planet as the site of his Waagh and the forces of Chaos are present, as well. However, Farseer Taldeer of Ullthwe Craftworld has foreseen that Necrons would soon awaken on that world and she must move to stop them. In the Winter Assault campaign, General Sturnn of the Imperial Guard has been tasked with salvaging the Imperial Titan Dominatus discovered on the planet Lorn V with the aid of Space Marines of the Ultramarines chapter. Spoiler warning: Plot and/or ending details follow.
