Sector Columbia Prime

Columbia Prime Sector is a segment of the Segmentum Pacificus with a total of four hundred worlds. The Columbia Prime Sector stands out for being home to the Chapters of "Imperial Brothers of the Sword", "The Avengers of Ferrus" and the "Knights of War." After the last events in the galaxy, the Sector has been subjected to an invasion of chaos with a propagation of chaotic cults difficult to control.

Sub-Sectors

 * Rust Belt: The Rust Belt is a term, sometimes considered pejorative, for an informal region of the Sector that experienced industrial boost. Rust refers to the industrialization, or organic decline, animal lost, and urban decay. The Rust Belt begins in Forge World Korinthos and traverses west of the Sector.
 * Imperator Belt: The Imperator Belt is an informal region in the South of the Sector in which socially conservative Imperial Cult plays a strong role in society and politics, and ecclesiarchy attendance across the denominations is generally higher than the sector's average.
 * Emperor Corridor: Emperor Corridor is a the areas of Eastern Sector that were settled by colonists of Ultramar. The Corridor stands out for the large number of Feudal World, Frontier World and Agri Worlds. Principle planets: Imperial Fork, the Sub-Sector capital; the Feudal world of Crimus; and the Saraj home of the Knights of War.
 * Golden Space: The Capital Sub-sector of the Sector, home of the Chapter of the Imperial Brothers of the Sword. The Golden Space stands out for a strong aesthetic similar to those used Ultramar although it also has a strong nucleus where ecclesiarchy has raised numerous cardinal worlds. Principle planets: Constantinomple, the Sector capital and sub-Sector naval base; the shrine world of Vatk; the Hive worlds of Atria and Verus; the fortress world Castillax; and the Castrum Mundi home of the Imperial Brothers of the Sword.
 * Siegerland: Considered the domains of the Avengers of Ferrus, Siegerland is a sub-sector with a strong element of the Astra Militarum, Siegerland was once home to an alien race called Ur-Uruk that although it was considered extinct, it turned out to have been so decimated that it took refuge in the planets for millennia until they finally emerged in what are called Uruk Uprisings, where every so many years the garrison must deal with the Uruk revolt and even enter its tunnels to clean them. Its principle worlds include the sub-Sector capital Siegen; Mainz, home of the sub-sector fleet; and the frontier planets of Hesser and Murgh.

Adeptus Astartes Chapters
The units listed below are the Sector's Adeptus Astartes Chapter forces:

Imperial Guard
The units listed below are the elite of the Sector's Imperial Guard forces: