Mortis

Mortis is the fifth volume in the Horus Siege of Terra sub-series, part of the Horus Heresy saga set in the Warhammer 40,000 universe. It opens with the triumphs at Saturnine and the self-sacrifice of those who held the Eternity Wall space port now receding into a fading hope. The rebels, rebuffed but unbroken, press harder against the Imperial Palace. With the major space ports under Horus's control, the Warmaster is emptying his reserves from the skies while the power of Chaos grows stronger with each assault.

The defenders find no rest even in sleep, as their waking despair is matched by dreams that lure them toward a false paradise. As the defences give way and the resolve of those manning them weakens, Horus orders the Titans of Legio Mortis to break through the walls. Standing against them are the forces of Mercury Wall and the Legio Ignatum. The two Legions' god-engines, long rivals, clash in battle, while inside the walls a handful of desperate people search for a way to push back the malign influence of the warp.

Across Terra, lost warriors and travellers make their way through wastelands and gardens of horror, heading for home and an uncertain future.