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From Warhammer 40k - Lexicanum
→Initial Imperial Expedition
===Initial Imperial Expedition===
====Prelude====
Shortly after his [[Terran Crusade|Return to Terra]], the reborn [[Roboute Guilliman]] learned of the beginnings of what would become the [[Necron]] [[Pariah Nexus]]. Advised by [[Belisarius Cawl]] as to the scale of the threat, Guilliman decided to first investigate the extent of the Necron network and then launch an expedition to destroy it. [[Battle Group Kallides]] was dispatched to first conduct a reconaissance-in-force of the [[Nephilim Sector]] and investigate the threat. Commanded by [[Groupmaster]] [[Marran]], the Imperial forces consisted of [[Imperial Guard]], [[Imperial Navy]], [[Mechanicum]], [[House Terryn]], [[House Mortan]], [[Ultramarines]], [[Black Templars]], [[Sisters of Battle]], and [[Legio Castigatum]]. Also present were [[Ordo Xenos]] detachments under [[Lord Inquisitor]] [[Kyria Draxus]]. Once this force had assessed the situation in the sector, Guilliman would personally lead [[Fleet Primus]] to destroy the Pariah Nexus. A great council of war including representatives from all major Imperial factions was held aboard the ''[[Dawn of Fire (Battleship)|Dawn of Fire]] '' where Guilliman outlined his strategy.{{Fn|11a}}
Moving into the Nephilim Sector, Battlegroup Kallides soon found the effects of the Pariah Nexus to be malign, with Imperial Guard forces that landed on worlds in the region often abandoning their posts, falling into panic, or simply becoming unresponsive. Space Marines and servants of the [[Omnissiah]] complained about headaches. Void-traffic was non-existent and communication all but impossible. Cities and worlds were found nearly entirely depopulated. The effects of the nexus only did not seem to effect the [[Adepta Sororitas]].{{Fn|1a}} In time the Imperials dubbed this effect the "Stilling".{{Fn|4a}}
