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'''{{PAGENAME}}''' began, when the [[Emperor's Children]] and the [[Riotous Host]] [[Traitor Titan Legion]] invaded the populous [[Imperium]] world [[Extremis Six]], during the [[Thirteenth Black Crusade]]. Under the orders of [[Lucius the Eternal]], the Riotous Host used their [[Sonic Weaponry]] to level Extremis Six's numerous starscrapers, which caused the deaths of billions.  Once word of the devastating invasion reached the Imperium, the '''352nd''' [[Elysian Drop Troops]], '''998th''' [[Harakoni Warhawks]] and the '''142nd''' [[Etharic Seraphs]] [[Regiments]], along with the [[Tempestus Scions]] formations of the '''12th [[Thetoid Condors]]''' and '''1st [[Zetic Harriers]]''', arrived on Extremis Six to enact vengeance on the traitors. However , in the battle that followed, the Regiments were completely destroyed by the forces of [[Slaanesh]], which were greatly aided by a [[Fulgrim|giant snake-bodied]] [[Daemon Primarch|Daemon, that easily killed]] any [[Astra Militarum]] [[Guardsmen]] that crossed its path.{{Fn|1}}