The Cytarine Subsector lies at the Spinward edge of the Ryxes Sector, and, compared to the much larger Lernaean Subsector which it borders, is a sparse area of space, with only a handful of habitable systems having been discovered so far. In recent years, the region has been subject to encroachment from elements of the T'au Empire's Fifth Sphere Expansion; taking advantage of the unrest and disruption caused by the coming of the Great Rift, they were able to capture several systems with virtually no fight. Though this swift progress has slowed somewhat, they maintain a strong foothold within the sector, and maintain tenuous links to the wider T'au Empire. The Dy'oth System (formerly the Diortan System whilst under the control of the Imperium) serves as their primary stronghold, and is close to becoming a true Sept.