Prometheus

Prometheus is the location of the fortress monastery headquarters of the Salamanders Chapter of the Space Marines/Adeptus Astartes. It is a moon of the planet Nocturne, the homeworld of the Salamanders Primarch, Vulkan, and the primary source of Salamanders recruits.

In stark contrast to nearly all other Space Marine Chapters, who reside exclusively within their fortresses or starships, whilst not "on duty" upon Prometheus or in battle, the Salamanders actually live alongside the civilian population of Nocturne, often serving as de facto leaders of the people.