After the betrayal at Isstvan, Horus begins a campaign against the Emperor. Galactic war on the threshold of Terra. But the open confrontation between son and father was preceded by seven long years, full of secrets, silence, plans and the concentration of forces among distant stars. The stories in this collection will shed light on the darkest years of the Horus Heresy, and revelations will surface that will shake the foundations of the Imperium. Age of Darkness presents new chapters of the epic conflict from the pens of the best authors of the Black Library: Dan Abnett, Graham McNeill, James Swallow, Aaron Dembski-Bowden and others.