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'''Sedna''' was a [[Sol System]] planetoid described as a "false" and "nemesis world". Following the [[Age of Strife]], Sedna it was ruled by an unknown kind of [[Xenos]] faction.{{Fn|1}}

During the early [[Great Crusade]] it was positioned in the , Sedna [[Sol SystemSedna Campaign|was attacked]] and was attacked by eight full [[Space Marine Legion]]s. With its xenos Xenos rulers dispatched through unknown psychic means, Sedna fell into silence and has since been lost by the [[Imperium]].{{Fn|1}} As for Sedna's Xenos, the [[Imperium]] deliberately destroyed all records of them.{{Fn|2}}

*{{Endn|1}}: [[The Horus Heresy Book Eight- Malevolence]], pg. 16*{{Endn|2}}: [[Journal Tactica: Skitarii]], pg. 17