Cadian Sector

The Cadian Sector is the Segmentum Obscurus administrative cube of the Cadian Gate, the sector box above the Cadian Sub-sector and the sister worlds that used to feed Cadia's kasrs.

For ten millennia this was the paperwork around the only fleet-scale corridor out of the Eye. When the pylons failed the sector did not vanish; it became the remaining lock. Pervigilium, Raeddon, and leftover wells still sit on the chart.

The Cadian Sector still matters because the Gate is a geography, not a single fortress world. Unofficial maps keep the Obscurus parent; Cadia stays a grandchild via cadian-system, not a direct child of this row.