From publisher blurb:
Sitting on a disk dozens of miles across is a city of metal and glass. Yet, for as intimidating as it appears from a distance the streets are a riot of warm colors and filled the soft sounds of laughter and good cheer. This is the city of Orbi: home to the exotic Nomi and galactic hub of entertainment.
Orbi isn't a normal city, however, but a city-sized ship and space-station that serves as home to more than half a million aliens from across the galaxy, most of who were picked up in their home systems, as Orbi touched down on their planets to sample their culture.
Landing on these worlds isn't an exception, but rather the rule. Thanks to the city-station's incredible Bend Engine, Orbi is more than capable of landing on nearly any planet they can reach.
Also included in this book are rules for the Nomi, the excitable six-limbed explorers of the universe. Gregarious and curious to a fault, this small race excels in the use of alien technology, using their excellent problem-solving skills and short term memories to break down alien cultures or mechanical problems with equal ease.
Orbi is a perfect fit in any science-fiction setting, such as the Starfinder Roleplaying Game, but already contains rules to be instantly adapted to a fantasy setting instead, such as the Pathfinder Roleplaying Game. And the mobile nature of the station says it doesn't need to only show up once - it can appear in different times and places throughout a campaign, no matter how far the party might travel.