Agartha subsector

The Agartha Sub-sector is a poorly documented division of the Caligari Sector, in Segmentum Tempestus, containing decaying hives and lethal garden worlds. The region is also subject to raids by the Drukhari, which the Ordos of the Inquisition long ignored.

The worlds Phaera, Tarantir, Gwaelod and Ormeus lie within the sub-sector. Tarantir is the location of the Stormwatchers, a Chapter that serves as the military arm of the Caligari Conclave. Warp anomalies and the Rift eventually drew the Inquisition’s attention to the region.

The sub-sector matters chiefly as part of the geography associated with Inquisitor-Martyr, and not as a mythical inner-earth. Unofficial notes on this site retain the Caligari Sector as its parent and do not posit a Terra-underworld here.