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The '''Trident''' was a formation within the [[Iron Warriors]] [[Legion]] during the [[Horus Heresy]]. It consisted of three '''Triarchs''', senior Legionaries (usually [[Warsmith]]s) who served as [[Perturabo]]'s advisers in military matters and as part of his retinue. Triarchs served until they died or lost Perturabo's confidence.{{Fn|1}}