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== History ==Fought in 803.[[M30]], the campaign was the last battle to liberate the whole [[Sol System]]. Eight full [[Space Marine Legion]]s were deployed against the [[Xenos]] "false world" of [[Sedna]]. The aliens were expunged by unknown [[psychic]] means using the powers of the [[Warp]]. In the aftermath, Sedna fell into silence and has since been lost by the [[Imperium]].{{Fn|1}} Though the Imperium subsequently destroyed all records of Sedna's Xenos, at least one "artefact" of the Sedna Campaign was preserved but sealed away in Vault Tharsis Deca-Nine on [[Mars]].{{Fn|2}}