Horus Heresy. Book VI

The Age of Darkness
After the betrayal at Istvaan, Horus begins his campaign against the Emperor. The galactic war is on the brink of Terra. But the open confrontation between son and father was preceded by a long seven years, filled with secrets, silence, plans, and concentration of forces among the distant stars. The tales of "The Age of Darkness" shed light on the darkest years of the Horus Heresy, and revelations that will shake the foundations of the Imperium will come to the surface.
The Outcast Dead
The galaxy is ablaze in the fire of civil war. Astropath Kai Zulaan accidentally becomes the repository of a secret capable of changing the future. The information hidden in his mind is meant for only one person in the entire universe, but many consider it their duty to extract it from the unfortunate astropath. Zulaan becomes a hostage of his gift and is forced to flee along with a company of prisoners from the strictest prison on Terra - the Astartes, once known as the Host of the Crusaders, now calling themselves the Outcast Dead. Kai Zulaan must decide to whom he will pledge his loyalty and unbearable knowledge.
The Lost Liberation
When the Heresy tore the Imperium apart, Primarch Corax and his Raven Guard barely managed to escape the trap set by Horus at Istvaan V. Having gained access to an ancient secret by the will of the Emperor of Mankind, Corax begins to rebuild the legion, devising plans for vengeance against the traitors. But the infiltrators of the most cunning and duplicitous of the traitor primarchs - Alpharius - have already penetrated the ranks of the Raven Guard. Corax's plans hang by a thread, along with the future of the Galaxies