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The '''Shadowlight''' was an ancient [[Xenos]] artifact created by an unknown race (presumably the [[Ancient]]s) long before the origins of [[Mankind]]. It was said to be as old as the [[Necrons]], so ancient that it was only known as a legend among the [[Eldar]]<sup>2</sup>.
During the [[First Siege of Perlia]], under the cover of the [[Ork]] invasion of the planet, Killian and Methius stormed the Shrine, killed the researchers and stole the Shadowlight, with the unwitting help of a squad of over-zealous battle-sisters from the [[Adepta Sororitas]]<sup>2</sup>. [[Commissar]] [[Ciaphas Cain]], leading an army of refugees across the Valley, discovered their handiwork, though he did not know until later who was responsible<sup>1</sup>.
Killian and Methius continued to study the Shadowlight in secret inside a Sororitas [[convent]] on [[Periremunda]], recruiting members of a local [[cultist|Chaos cult]] to serve as "test subjects." When Cain and Inquisitor [[Amberley Vail]] confronted Killian, he attempted to escape with it, only to inadvertently handle it without protection, killing him<sup>2</sup>.
The Shadowlight was returned to Perlia and the Shrine was rebuilt. Over the next few decades, several more components of the machine were discovered, and it was partially reassembled<sup>3</sup>.