High Quality Content by WIKIPEDIA articles! Warhammer 40,000: Dawn of War –Dark Crusade is the second expansion to the PC-based RTS game Warhammer 40,000: Dawn of War developed by Relic Entertainment and published by THQ. Based on Games Workshop`s popular tabletop wargame, Warhammer 40,000, Dark Crusade was released on October 9, 2006. The expansion features two new races, the Tau Empire and the Necrons. Including the Imperial Guard from Dawn of War`s first expansion pack Winter Assault, this means a total of seven playable races in this expansion.