Battle for Pandora Prime

Space Marines Portal
Blood Angels

Space Marines Portal
Ultramarines

The Battle for Pandora Prime began when the Hive World was invaded by the forces of the Orks, Chaos and the Eldar. The seeds for this conflict were planted long ago, when an ancient evil had been defeated and sealed beneath Pandora Prime by the Eldar, well before it was colonized by the Imperium. Though the Eldar thought it was defeated, their foe's power had now, millenia later, drawn the forces of an Ork Warboss and Chaos Lord to release it, from where it now dealt beneath the Hive city of Oberon. After receiving a vision of what was to come if it was unleashed, a Farseer also arrived on Pandora Prime with an Eldar warhost; intent on permanently destroying the ancient evil, and all those who sought to claim its power. Though it was now beset on all sides by the invading forces, all hope was not lost for Pandora Prime, as a Space Marine task force, composed of the Blood Angels and Ultramarines, soon arrived to aid the beleaguered Hive World.^[1]

Source

• 1: Warhammer 40,000 Collectible Card Game (game system): Battle for Pandora Prime, expansion description for factions