As dangerous as the incursions from the Tyranids may be, they are only one of the rising threats to the Imperium. After ten thousand years, the Traitor Legions at last seem to be putting aside their differences. That Chaos should finally follow the tactics dictated by Abaddon of a massed crusade would be a terrible irony. What their intentions would be are unknown, but if the Ruinous Powers were to attempt a second assault on Holy Terra, the bloodshed would be truly apocalyptic. PDF最后一段说明混沌已经开始黑暗远征。