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The grey and gold [[Regiments]] were among the [[Imperial]] forces that defended the [[Ultramarines]]' [[Imperium Secundus]], as the [[Horus Heresy]] raged. The Gilded Sentinels would later be tasked with aiding the [[Space Marine Legion|Legion]]'s efforts to replenish the losses they suffered in the [[Battle of Calth]]. This led several of the Sentinels' artillery Regiments to be dispatched to recover the Ultramarines' [[Gene-seed]] that was stored on [[Talassar]], with the [[Luminous Host]] [[Solar Auxilia]] and [[Judiciar]] [[Aster Crohne]]'s [[Blood Angels]] forces. However by then, the world was in rebellion after the [[Night Lords]] had invaded Talassar and turned some of its population against the Imperium.{{Fn|1a}} Despite the [[Traitor Legion]]'s efforts though, the Blood Angels succeeded in reclaiming the Gene-seed from '''Velx City''''s '''Castrum Velx''' fortress.{{Fn|1b}}

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