Sedna Campaign

The Sedna Campaign was an early campaign of the Great Crusade in the fought in 803.M30.

The campaign represented the final battle to liberate the outer regions of the Sol System from the grip of aliens who had preyed upon humanity's home star system during the chaos of Old Night.

Eight entire Space Marine Legions were deployed against the xenos who controlled the "false world" of Sedna at the very outer reaches of the Sol System, beyond the orbit of Pluto.

The alien foe was destroyed by them through the use of unknown psychic means. In the aftermath, Sedna fell into silence and was lost to Imperial knowledge.