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From Warhammer 40k - Lexicanum
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→Origins
==Origins==
Ten thousand years ago, [[Horus]], [[Warmaster]] of the [[Imperium]] and most trusted 'son' of the [[Emperor]], fell under mysterious circumstances the sway of Chaos due to Chaosthe actions of Chaplain Erebus of the Word Bearers Legion under orders from Primarch Lorgar. Besides the [[Space Marine Legion]] under his direct command, the ''Sons of Horus'', eight of his brother-[[Primarch]]s and their legions also joined him in the [[Horus Heresy]] against the Emperor.
Only when Horus was slain at the ultimate conflict of the Heresy, was the rebellion broken and the defeated Traitor Legions hounded into the [[Eye of Terror]], which remains both their prison and sanctuary to this day.
