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The '''Invincible Reason''' was a [[Gloriana Class Battleship]] of the [[Dark Angels]] [[Space Marine Legion|Legion]] during the [[Great Crusade]] and [[Horus Heresy]]. The personal ship of [[Primarch]] [[Lion El'Jonson]], the ''Invincible Reason'' led the Dark Angels effort in the [[Battle of Diamat]] and the [[Thramas Crusade]].{{Fn|1}}