The unthinkable has happened Terra has fallen to the traitor forces of Warmaster Horus! Nothing else could explain the sudden disappearance of the Astronomican's guiding light at the heart of the Imperium, or so Robute Guilliman would believe. Ever the pragmatist, he has drawn all his forces to Ultramar and begun construction of the new empire known as Imperium Secundus. Even with many of his primarch brothers at his side, he still faces war from without and intrigue from within with the best of intentions, were the full truth to be known it would likely damn them all as traitors for all eternity.

A sprawling, complex tale of magic and destiny that won't disappoint its readers. This auspicious beginning for author Peter Orullian will have you looking forward to more.--Terry Brooks.

In the wake of the Dropsite Massacre at Isstvan V, the survivors of the Salamanders Legion searched long and hard for their fallen primarch, but to no avail. Little did they know that while Vulkan might have wished himself dead, he lives still. As the war continues without him, all eyes turn to Ultramar and Guilliman's new empire there, and Vulkan's sons are drawn into an insidious plot to end the Heresy by the most underhand means imaginable.

The vicious Night Lords Legion attempt to destroy any hope for the future of humanity. With the noble Emperor Sanguinius ruling from Macragge, Imperium Secundus stands as a lone beacon of hope even as the Warmaster’s forces continue to ravage the rest of the galaxy. Roboute Guilliman, still Master of Ultramar, has convinced his brother that Terra has fallen and that the mysterious Mount Pharos on Sotha now holds the key to mankind’s future. But the Night Lords, those cruel and pitiless sons of Konrad Curze, have been watching from the shadows, and make ready to launch their long-planned attack on the Pharos itself…

Book 4 in the Global best selling The Horus Heresy: Siege of Terra series. The Traitor Host of Horus Lupercal tightens its iron grip on the Palace of Terra, and one by one the walls and bastions begin to crumple and collapse. Rogal Dorn, Praetorian of Terra, redoubles his efforts to keep the relentless enemy at bay, but his forces are vastly outnumbered and hopelessly outgunned. Dorn simply cannot defend everything. Any chance of survival now requires sacrifice, but what battles dare he lose so that others can be won? Is there one tactical stroke, one crucial combat, that could turn the tide forever and win the war outright?

Jaghatai Khan and his White Scars Legion must choose - the Emperor or Horus? Fresh from their conquest of Chondax and the discovery of Horus’s rebellion, Jaghatai Khan’s warriors stand divided. Long considered one of the less trustworthy Legions, many of the White Scars claim to owe their loyalty exclusively to Terra, and others still to the Warmaster and his warrior lodges. But when a distress call from Leman Russ of the Space Wolves brings the wrath of the Alpha Legion to Chondax, the Khan’s hand is forced and the decision must be made – in the great war for the Imperium, will he side with the Emperor or Horus?

For the first time in the New York Times bestselling series, this omnibus returns to the beginning of The Horus Heresy. The novels Horus Rising, False Gods and Galaxy in Flames are presented alongside additional stories that set the stage for the unimaginable conflict still to come... It was to be the dawn of a glorious new age. Following countless millennia of darkness and strife, the armies of the Emperor of Mankind had reconquered world after world in a Great Crusade, the like of which the galaxy had never seen. Having established themselves as the most powerful military force ever to march under a single banner, the Space Marine Legions were each led by a god-like primarch – those apparently immortal sons of the Emperor himself. Humanity seemed set to rule the stars once more. And then came Horus. The noble Warmaster, and reviled arch-traitor. For the first time in the New York Times bestselling series, this omnibus returns to the beginning of The Horus Heresy and shines new light on the events that preceded it. The novels Horus Rising,False Gods and Galaxy in Flames are presented alongside additional stories that set the stage for the unimaginable conflict still to come...

Setting out to exterminate the upstart Tau Empire before it becomes a threat, the Ultramarines under Captain Atheus discover that the xenos may be more of a menace than they originally believed… The Imperium of Man takes its bloody revenge upon the expansionist tau in a war of dizzying spectacle. For the first time, the daredevil warriors of the Ultramarines Assault Company go to war en masse, fighting in the skies, in the streets, and even in the prototype testing facilities of the tau Earth caste. However, Sergeants Sicarius and Numitor must overcome their hunger for glory as the brightest stars of the Tau Empire, Commanders Farsight and Shadowsun, hunt them to the brink of disaster. Tempers run short as battle-brothers fall, ammunition runs out and the course of the war takes ever-darker twists and turns. With two warrior cultures struggling for a vital edge and the body count spiralling towards a terrible conclusion, can notions of honour and duty survive at all?

With Imperium Secundus a failed dream, the primarchs of the Triumvirate swear to reach Terra and defend the Imperium's heart. But danger awaits them, and their destinies are in their hands… 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, linkand each marches towards his own ruin.