Chaos Space Marines

Chaos Space Marines - also known as Traitor Marines, Renegade Marines, or Heretic Astartes, are former Space Marines of the Imperium of Man who have chosen to turn their backs on the Emperor of Man and instead surrender themselves to Chaos.

You can read about all the other factions in Warhammer 40k here.

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These corrupt Astartes usually belong to one of the nine original Traitor Legions that betrayed the Emperor during the ancient civil war, the Horus Heresy, more than 10,000 years ago - although some have joined long after the end of the civil war. Chaos can take over Astartes at any time and place, just as sirens lure men to their deaths.

Some Traitor Marines swore their service to all four Dark Gods, also known as Chaos Undivided, while others preferred to dedicate themselves to one of them. The Traitor Legions were led by Warmaster Horus, a former primarch of the Imperium and the Emperor's most trusted friend, son, and advisor - before he was tempted by the Dark Gods' promises and lies, as well as his own flaws and ambitions.

Chaos Space Marines can also be played in Kill Team, which you can read more about here.

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