In the cult's chambers high up in the Siren Tower, the surviving Blood Angels count the cost of their war with the cult. They are soon joined by Magos Dominus Castia-Theta-9, who offers them a chance to escape Niades.
While Ancaeus' surviving warriors follow Castia's Servitors through the under-tunnels of Niades, the Tech-priest explains her plan to the paralysed Captain Orpheo. High above them, in the inner sanctum of the Siren Tower, the Genestealer Cult's Magus tells her brood-kin the hour of their ascension is nigh.
The Blood Angels fight their way ever deeper into the evil that has corrupted the world of Niades, with new and brutal enemies assailing them on all sides. Can their strength hold in the face of such fearsome foes?
As the Blood Angels on the surface of Niades cut a course through the entrenched Genestealer Cultists towards the signal from Captain Orpheo's beacon, the situation aboard the Sword of Baal goes from bad to worse.