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The '''Warrior Lodges''' were a group of secret fraternities formed by members of the [[Space Marine Legion]]s during the [[Great Crusade]]. They eventually led to the division of the Legions into factions that facilitated their fall to [[Chaos]] and the start of the [[Horus Heresy]]. Warrior Lodges were covertly spread by the [[Word Bearers]], who had secretly fallen to [[Chaos]], as a means to subvert the loyalties of each Astartes Legion.{{Fn|5}}

In [[M41]], ten thousand years after the Heresy, the formation of secret brotherhoods between self-appointed "elite" soldiers was still regarded as a warning sign of [[Chaos]] corruption. [[Commissar]] [[Ciaphas Cain]] made a point of lecturing his students at the [[Schola Progenium]] about it, the better for them to spot, and hopefully head off, the development of [[Traitor Guard]] units.{{Fn|4}}