As the Great Crusade burns across the stars, the primarch of the White Scars, Jaghatai Khan, must decide where his true allegiance lies. Ever since the Imperium's rediscovery of the world of Chogoris, the White Scars' culture of warrior mysticism has sat uneasily with the ideals of Unity. As the Great Crusade burns across the stars, their enigmatic primarch Jaghatai Khan fights to preserve his Legion's distinctiveness amid a galaxy where cold rationality holds sway. Despite his self-imposed isolation, others in the brotherhood of primarchs seek to draw him into the greatest ideological battle of them all: the place of psychic power within the Legions. As the Librarius project is born, and opposition to it grows, the Khan must decide where his greatest allegiance lies – to the Imperial Truth, or to his own heritage.

The full powers of Chaos are revealed as the Horus Heresy blazes towards Terra. For too long the Vth Legion had ranged out beyond the sight of the wider Imperium, remaining ignorant of the Warmaster’s rebellion and the war that inevitably followed. Only once their primarch, Jaghatai Khan, had satisfied himself that the path before them was just and true did the White Scars choose a side, taking the fight to the traitors on every front. But, four years later, the Legion’s unfettered spirit has been broken by relentless attritional warfare against the Death Guard and the Emperor’s Children. The Khan’s Stormseers must find a clear route to Terra if they are to take part in the final, apocalyptic battle.

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?

Created in the Emperor's own image, the primarchs had long thought themselves to be princes of the universe and masters of their own destiny--they led the Space Marine Legions in glorious conquest of the galaxy, and no enemy of the Imperium could stand against them. However, even amongst this legendary brotherhood, the seeds of dissent has been sown long before the treacherous Warmaster Horus declared his grand heresy. Gathered within this anthology are four novellas focusing on some of the mightiest warriors and leaders that mankind has ever known--Fulgrim, Ferrus Manus, Lion El'Jonson and the twin primarchs Alpharious and Omegon--and the roles that they may have yet to play in war which threatens to change the face of the Imperium forever.

Abandoned by their kinsmen and hounded into the Alaxxes Nebula, Leman Russ and his Space Wolves face the Alpha Legion fleet for one last, glorious battle. The Space Wolves were set upon by the forces of the Alpha Legion before they had even recovered from the Razing of Prospero. Hounded to the edge of the Alaxxes Nebula, in desperation Leman Russ called out to his primarch brothers and their Legions for aid. None came. Now, with their fleet stranded and supplies dwindling, the warriors of the Rout face almost certain death amidst the rust-red clouds of the nebula. But what a glorious end it shall be, worthy of the sagas of old, for Alpharius's sons will soon learn that a cornered wolf is always the most deadly.

Book 13 in The Horus Heresy Primarch Series Each primarch is an exemplary being, derived from the Emperor’s own genetic stock to embody a facet of His personality. Their powers are unfathomable, but only one of them is the First. Lion El’Jonson is the paragon of what it is to be a primarch. His Legion, pre-eminent for most of their long history, typify the virtues of temperance, pride, and martial excellency that the Lion embodies. They are the Emperor’s last line and final sanction. They are His Dark Angels. Now, while the Emperor gathers His mightiest sons for an assault on Ullanor Prime, the Lord of the First instead draws his Legion to the farthest reaches of the known galaxy, seeking to subdue a single rebellious world. Is this but another example of the Lion’s infamous pride, or is there more afoot amidst that graveyard of empires that is the Ghoul Stars, more than the Lion will share even with his own sons?

Mustering for war against the orks, the Ultramarines Legion is attacked by the Word Bearers on the planet of Calth, and the forces of Chaos openly reveal their part in the Heresy. Unaware of the wider Heresy and following the Warmaster’s increasingly cryptic orders, Roboute Guilliman returns to Ultramar to muster his Legion for war against the orks massing in the Veridian system. Without warning, their supposed allies in the Word Bearers Legion launch a devastating invasion of Calth, scattering the Ultramarines’ fleet and slaughtering all who stand in their way. This confirms the worst scenario Guilliman can imagine – Lorgar means to settle their bitter rivalry once and for all. As the traitors summon foul daemonic hosts and all the forces of Chaos, the Ultramarines are drawn into a grim and deadly struggle in which neither side can prevail.