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? 

Attached to Crusade Fleet Quintus - dubbed the Cursed Fleet by many - the Ultramarines of the Ithraca’s Vengeance are drawn to a stricken world. With millions enslaved, a malign necron technology siphons the souls of the innocent and heralds the Silent Kingdom’s expansion. The Ultramarines face an impossible decision: mount a desperate last stand to destroy the Pariah Nexus, or break away and damn the entire sector to bring word of this ancient foe’s resurgence to the only being capable of halting it - the Lord Primarch Roboute Guilliman.  

Constantin Valdor. It is a name that brings forth images of heroism, honour and peerless duty. For it is he who commands the will of the Legio Custodes that most esteemed and dedicated cadre of elite warriors. He is the Emperor’s sword, His shield, His banner and he knows no equal. Clad in shining auramite, his fist clenched around the haft of his Guardian Spear, he is the bulwark against all enemies of the throne, within or without. Nearing the end of the wars of Unity, Valdor’s courage and purpose is put to the test as never before. 

In the centuries since his return from Commorragh, Fabius Bile has distanced himself from the affairs of friend and foe, content only to oversee the cruel evolution of his New Men. But when his creations are threatened by the monstrous haemonculi of the Thirteen Scars, the Manflayer is forced to seek out new allies and old enemies alike in an effort to preserve all that he has built. Homo Novus must survive...even if Fabius Bile must die to ensure it.   

As the Emperor travels the galaxy at the head of his Great Crusade, few events are as important as rediscovering his scattered sons, the Primarchs, and bestowing them as the masters of their Legions. United, a Legion becomes a reflection of its Primarch, both in his strengths and his flaws. For the Twelfth Legion, once the War Hounds and now the World Eaters, the line between strength and flaw is almost impossible to separate.

The war for the fate of mankind blazes on. Though the outer defences have fallen, the walls of the Palace itself remain inviolate as Rogal Dorn, the Praetorian of Terra himself, uses every known stratagem and ploy to keep Horus' vast armies at bay. In Perturabo, the Traitor siegebreaker, Dorn faces an adversary worthy of his skill. A terrible, grinding attrition ensues. The crucial battle for the Lion's Gate spaceport is at the heart of this conflict. With it in their possession, the Traitors can land their most devastating weapons on Terran soil. Dorn knows it must not fall.

The hunters have become the hunted. The Night Lords flee to the dark fringes of the Imperium to escape their relentless pursuers - the aeldari of Craftworld Ulthwé. Their flight takes them to the carrion world of Tsagualsa, where their primarch died and their Legion was broken. There, history will repeat itself as a deadly assassin stalks the shadows, and the Night Lords are drawn into a battle they are destined to lose. 

Driven on by their hatred of the False Emperor, the Night Lords stalk the shadows of the galaxy, eternally seeking revenge for the death of their primarch. Their dark quest leads them to a fractious alliance with the Red Corsairs, united only by a common enemy. Together with this piratical band of renegades, they bring their ways of destruction to the fortress-monastery of the Marines Errant.

As Guilliman, Regent of Terra, heads off to lead the Indomitus Crusade, he leaves behind a world still in turmoil, beset by cult activity. Stripped of its huge armies for the galactic offensive, recovery is precarious. The Custodians do what they can while keeping the Palace secure, and the Sisters of Silence rebuild their citadel on Luna. When the warship Phalanx returns, it seems that stability will at last be assured. However, as reconquest forces push out further into the slums, they come across signs that another mysterious foe is active.

On the 13th day of Secundus, the bombardment of Terra began. With the solar defences overcome through the devastating strength of the Traitor armada and the power of the warp, Horus launches his assault on the Throneworld in earnest. After withstanding a ferocious barrage of ordnance, an immense ground war commences outside the Palace, with every inch gained paid for in the lives of billions. 

On the world of Verghast, a grinding war between two hive cities - one loyal to the Imperium, the other fallen to the worship of the Dark Gods - is bolstered by the forces of the Astra Militarum, spearheaded by the Colonel-Commissar Gaunt and the Tanith First and Only. But bitter rivalries and treachery threaten to derail the defence of Vervunhive, and it falls to Gaunt to take command of the Imperial forces and forge victory from an almost certain defeat.   

Ciaphas Cain's latest mission takes him and his Valhallan regiment to the planet of Adumbria to defend against an approaching Chaos invasion. However, infighting with fellow Imperial Guard regiments from the world of Tallarn, commanded by an old 'friend' of Cain's from the Schola Progenium and the uprising of a sinister cult on the planet puts paid to any hopes of an easy life.

Glory returns to Fenris. Magnus the Red and his traitorous legion are defeated upon the icy cliffs of the Space Wolves’ home world, their hollow remains scattered into the darkest depths of the World Sea. Yet Ragnar Blackmane, the youngest Wolf Lord in his Chapter’s noble history, does not feel victorious. He is uneasy. Uncertain of his purpose and place in the great war for the Imperium. Until a vision strikes him of a terrible beast, one greater than any he or his warriors have faced before. 

Born to a life of political conflict, Perturabo was always considered a child prodigy among the people of Olympia - indeed, his philosophical and scientific works were beyond compare. But then, after his rediscovery by the Emperor and decades of thankless military campaigning on the Great Crusade, the primarch begins to resent his Legion's place in the Imperium.

The shrine world of Divinatus Prime has become lost to the light of the Astronomican, and no ship can piece its veil. Only the Lord of Death himself, Blood Angels Chief Librarian Mephiston, has any hope of discerning the fate of this once pious world. After enacting a powerful blood ritual, Mephiston and an honour guard of his fellow Blood Angels reach the stricken shrine world to find it seized by religious civil war. Each faction fights for dominance of a potent artefact, the Blade Petrific, said to be wrought by the Emperor Himself.