The rogue planet designated as Three-Hundred Fifty is a dead world located in the Sephadollion Sector. While technically located within the Donek Sub-Sector, the fact that it is little more than a large slab of rock floating in space has given the Imperium little reason to grant Three-Hundred Fifty any attention. However, there is a classified piece of information that only those of the Tenebarite Cabal and select members of the Sephadollion Conclave are aware of: Hollowed deeply within the planet’s mantle is the base of operations for the Tenebarite Cabal as they conduct operations against the deadly clandestine organization known as the Vitores Tenebras.