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The '''{{PAGENAME}}''' or '''Nephilim War''' is a campaign of the [[Psychic Awakening]] and [[Indomitus Crusade]].{{Fn|1}} While initially a standard [[Imperial]] expedition to investigate the fate of the [[Nephilim Sector]], it has since escalated into a four-way conflict involving Humanity, [[Chaos]], and two differing Necron factions.{{Fn|9e}}

==Overview==

===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. 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}} During the council Guilliman declared that [[Battle Group Kallides]] was dispatched to first conduct a reconnaissance-in-force of the [[Nephilim Sector]] and investigate the threat. Commanded by [[Groupmaster]] [[Kaspar Marius Todoric 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]] with support from [[Fleet Tertius]] to destroy the Pariah Nexus. Cawl outlined how destroying the Necron "keystone" [[Cadian Pylon|Pylon]] at [[Mesmoch]] in the [[Zeidos System]] would severely disrupt the network. Unknown to most of the Imperials, Cawl's true target was [[Planet 7/2]], with the attack on Mesmoch as well as a fleet incursion in the [[Paradyce System]] meant as a diversion to draw away the Necrons.{{Fn|11b}}