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In the aftermath of the Dropsite Massacre at Isstvan V, a battered and bloodied force of Iron Hands, Raven Guard and Salamanders regroups on a seemingly insignificant death world. Fending off attacks from all manner of monstrous creatures, the fractious allies find hope in the form of human refugees fleeing from the growing war, and cast adrift upon the tides of the warp. But even as the Space Marines carve out a sanctuary for them in the jungles of Pythos, a darkness gathers that threatens to consume them all...

Imperium Secundus lies revealed as a heretical folly. Terra has not fallen, though it remains inaccessible. Sanguinius, Guilliman and the Lion El'Johnson, the primarchs of the Triumvirate, must reach Terra at all costs. They seek to defend the Emperor, and to atone for their sins. But the Ruinstorm, a galaxy-wide maelstrom of chaos, hides the Throneworld from the primarchs. Now the fleets of three Legions depart Macragge, and the primarchs will stop at nothing to overcome the Ruinstorm. Yet an insidious enemy watches their every move, and plots against the weaknesses of the errant sons of the Emperor. Each has his own inner storm, and each marches towards his own ruin.

Launch title in The Horus Heresy: Primarchs series, a brand new sequence of novels from Black Library.

Long before the coming of the Imperium, the realm of Ultramar was ruled by Roboute Guilliman, the last Battle King of Macragge. Even after learning of his true heritage as a primarch son of the Emperor of Mankind, he strove to expand his domain as efficiently and benevolently as possible, with the XIII Legion Ultramarines as his alone to command.

Now, facing a rival empire on the ork-held world of Thoas, Guilliman must choose his weapons carefully--otherwise his dream of a brighter future could be lost forever.

As the Emperor marshals his armies to reclaim the galaxy for the glory of mankind, one by one his Space Marine Legions are reunited with their missing primarchs. The XVIII Legion are still waiting to find their true identity, unaware their own lord has been found. In the Taras Division, legionaries face annihilation as they take a last, desperate stand against a monstrous ork invasion. Meanwhile, on Nocturne, Vulkan has raised and trained a new force of warriors. Now it is the time for him to lead his sons into battle. Now it is the time for him to truly don the mantle of primarch, not only to save one half of his Legion, but forge a new, indivisible whole.

As the Emperor marshals his armies to reclaim the galaxy for the glory of mankind, one by one his Space Marine Legions are reunited with their missing primarchs. The XVIII Legion are still waiting to find their true identity, unaware their own lord has been found. In the Taras Division, legionaries face annihilation as they take a last, desperate stand against a monstrous ork invasion. Meanwhile, on Nocturne, Vulkan has raised and trained a new force of warriors. Now it is the time for him to lead his sons into battle. Now it is the time for him to truly don the mantle of primarch, not only to save one half of his Legion, but forge a new, indivisible whole.

Once, the Galaspar System suffered under the cruel regime of the Order. Billions of people toiled endlessly to enrich their masters, enduring short lives of poverty, squalor and fear. But Galaspar's sins did not go unnoticed by the Imperium, and so Death itself sentenced the Order to annihilation.

Mortarion, newly uplifted to commander of the Death Guard, descended upon the world, and with him came a slaughter of untold proportions. The sheer brutality of Mortarion's campaign left the Imperium appalled. Seeking to understand its horrors, two noble primarchs have come to Galaspar, summoning their brother to account for his actions. But the Pale King brooks no challenge to his methods, for when the scythe falls, it reaps a gruesome toll.