Nostramo Sector

The Nostramo Sector is the sunless Ultima administrative cube whose principal world Nostramo was an adamantium hive of night-crime until Konrad Curze bombarded it to fragments. A moon-locked eclipse kept the planet in darkness; its pale people filled the Night Lords, and then the primarch decided the hive no longer deserved to exist.

Sister rocks such as Cairn, Kalleth, Kruun, and Ulan Hûda share the chart, along with the Occludus System. The sector pin is larger than one murdered hive: it is the neighbourhood the VIII Legion came from, a geography of darkness that later millennia still treat as cursed space. Tenebor and the Shroud of Eventide keep the aesthetic honest.

The Nostramo Sector still matters because the Night Lords' origin is a place, not only a dead primarch. Unofficial fan maps keep the Ultima parent and leave Nostramo a child of this sector rather than inventing a missing system row.