For many years, the pre-history of the Warhammer 40,000 universe has been cloaked in mystery. Now, at last, in these two companion volumes we can reveal the true tale of the dividing of the Imperium, the treachery of the Emperor's most loyal lieutenant, Horus, and the fall of many of the Space Marines under the sway of Chaos. Stunning art and apocalyptic text combine to tell the legend for the very first time. A must for all who want to know more about the dark and sinister past of the Warhammer 40,000 background.