Voyage of the Jeanne d'Arc
The Nim system was once home to three colony worlds. All three worlds were Ravaged during the Great Netherwar, however, and now the remnants of the colonists live in a series of space habitations and gargantuan cruiser ships.
Nim society functions under a strict caste system, which the locals enforce with zeal. Of further interest is the fact that Nim is home to no subspecies, not even Zerogs. This, obviously, strikes many people as odd, though no one has yet been able to prove any untoward activity on the part of the Nim government.
The primary space station in the Nim system is Nim Station. It is home to nearly three billion souls, and consists of an elaborate lattice structure that extends many kilometers in any given direction.