This is the 1st printing of the codex for the 3rd edition rules of Warhammer 40,000.Codex: Chaos Space Marines : Ten thousand years ago the Imperium was racked by a civil war called the Horus Heresy. The rebellion was led by the Emperors most trusted of Primarchs, Warmaster Horus. He had been led to believe by the treacherous Chaos gods that he, not the Emperor, was to be the leader of humanity. Almost half of the Space Marine legions went traitor, plunging the Imperium into a galaxy spanning civil war. The bloody rebellion ended with the death of Horus at the hands of the Emperor himself. Barely alive, the Emperor was placed upon the life support system known as the Golden Throne. With the Warmaster Horus slain, the remaining Traitor Marines fled into the Eye of Terror, a tear in the very fabric of reality where Chaos reigns. They lurk there to this day, consumed by their hatred for the Emperor, the Imperium , and all of mankind. The dread forces of the Chaos Space Marine Legions - traitorous Space Marines who now fight for the glory of the dark gods, make Chaos armies one of the most fearsome opponents that any Commander could ever hope to face on the battlefields of the 41st millenium. The Codex book is vital to any would be Lord of Chaos. Inside the Codex: Chaos you will find a complete army list, background, additional rules to represent one of the Chaos Legions, and much more.