The Adrantis Sub-Sector is one of the several sub-sectors of the Calixis Sector, home to the wild and untamed Adrantis Nebula, the majority of which is unexplored and highly dangerous. The comparatively few worlds that are colonized are all along the outlying regions of the nebula. Egoyan Cestelle of the Cestelle Alliance is the governor of the Adrantis Nebula, personally appointed by Sector Governor Marius Hax. Cardinal Pyris Valcarna is the Cardinal of the Adrantian Diocese. The sector is located trailing of the Golgenna Reach and is bordered by the Drusus Marches, the Josian Reach and the Hazeroth Abyss.
The Adeptus Mechanicus maintains several secretive outposts bordering the Adrantis Nebula along with the Hippocrasian Agglomeration and has sent at least sixty-four Explorator fleets into the untamed volumes of the nebula at the behest of the secretive priests of the Machine God. Battlefleet Calixis often patrols the danger zones of the nebula, wary of dark forces within.
The Adrantus Nebula is rumored to have once been home to a civilization known as the Adranti. Magos Genetus Halix Redole has spent four-hundred years studying the twisted legacy, which has earned him the ire of Cardinal Valcarna, who does not wish for knowledge of the Adranti to spread.
- Lehyde Ten
- Morwen VI
- Omnicron 71-DX
- Piety of Seth
- Tephaine System