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During the Horus Heresy, the planet became divided as civil war erupted across the Imperium. The loyalist faction was led by Magos Heironymax Veltarae and the traitor faction by Bellonitrix. The traitor forces were superior in number, creating a difficult situation for the loyalists until a Dark Angels fleet led by the Invincible Reason itself arrived seeking repairs. Lion El'Jonson agreed to aid the loyalists against the traitors, subsequently crushing them with the Dreadwing.