The Raven Guard under Corax continue to gather all leaderless loyalists to their banner, determined to take the fight to Horus and his heretics. In the industrial nightmare of the underhive, the XIXth Legion receive a lesson in terror tactics from the most unlikely of allies – the Night Lords... The Night Lords are often seen as the dark mirror of the noble Raven Guard, but how much of that is true? Are these two Legions poles apart, or closer than any within the XIX would dare admit...