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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]] and [[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, in the aftermath of the world's devastation. 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]] forces [[Guardsmen]] that crossed its path.{{Fn|1}}