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Fictional system; created by Derelict team, possibly confused with real-life Tau Ceti. All statements in this article are non-canon. It is used in the campaigns Derelict and Into the Halls of Valhalla.
- 212th Scythes deployed to Tau Sigma mining colonies to defend against pirate activity.
- Discovery of the SD Nyarlathotep in the Altair-Tau Sigma jump corridor.