His actions unknowingly summoned a warband of the Alpha Legion Chaos Space Marines to the Kaurava System, thus initiating the conflict.

The reason for the Warp Storm, as explained after the conquest by the forces of Chaos, began with an ignorant Imperial Guardsman with latent psyker genes who was whispered to by the Chaos Gods, who told him to prepare a sacrificial ritual and he complied. The nine factions are then forced to battle between planets to ultimately conquer the planetary system and discover the reason for the emergence of the Warp Storm. However, the Warp Storm wreaked havoc on their navigation interfaces, stranding them on the four inhabited planets and three moons of the system. The nine factions were drawn to investigate the system from across the galaxy with their own fleets and conflicting intentions.

The Kaurava Campaign began after the sudden appearance of a Warp Storm near the world of Kaurava IV. The Platinum Edition of Dawn of War includes the original game and its two previous expansions, Winter Assault and Dark Crusade. All nine factions are available for play in the campaign and single player skirmish games, but in order to play as the older factions online, the player must have all of the previous respective games to unlock them. Much like its popular predecessor, Dark Crusade, Soulstorm is a stand-alone expansion pack.

Dawn of war soulstorm race unlocker