
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 strike cruiser Sword of Baal hangs in orbit over the planet Niades, trapped by warp storms. Aboard, the ship's complement of Space Marines chafe at their inaction.
On the trail of their missing Captain, the Blood Angels deploy to the surface of Niades by Drop Pod. Their journey is not a smooth one, and they must regroup to explore the ruined city at the base of the docking tower.
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.