Sepheris Secundus is a feudal Mining World located in the Golgenna Reach Sub-sector of the Calixis Sector in the Segmentum Obscurus. Sepheris Secundus is a world of immense mineral wealth, city-sized mines, billions-strong hordes of serfs and the sharpest divide between the elites and the masses in the Calixis Sector. It is a grim place of snow and twilight, feral mutants and lives spent in back-breaking labour deep beneath the ground. The Imperium’s eagerness to exploit Sepheris Secundus’ vast resources is such that the planet is at the same time the richest and poorest world in the sector.