Geoshii history claims they were once a planet-bound species. Peerless weaponeers and droidisans, they were commissioned to create the most terrible weapon the galaxy had seen, a tool of destruction unmatched even since the Shattered Era. For their payment, they were destroyed by the jealous Empire, scourged with poison and fire to ensure that no-one else knew the weapon's secrets.
Only a few survived, and returned to the surface to find their home a broken, blackened ruin, hot with radiation and toxins. They soon learned to survive in this harsh clime, supplementing failing flesh with powerful metal, sealing away their own breath and making weapons of themselves, and as the oncoming Shattered Era saw planet after planet sundered by Imperial hubris, the legendary Worm Queen foresaw that her children must spread among the stars to survive.
In the modern day, the Geoshii have fulfilled her prophecy. Part chitinous flesh, part droid, they roam between suns in hollow cybermoons, wandering habitats of rock and steel worked from asteroids and moonlets, harsh forge-hives suited only to the extremophiles they have become. No Geoshii would call a planet "home", for such places are vulnerable, weak, lazy. This superstition sees even migrant Geos shun habitable planets in favour of settling on merchant cruisers, space stations, or pirate fleets.
Birthed from the pulsating womb-barracks of each Geoshan moon's Queen – equal parts techno-organic factory and living avatar of the cybermoon's droidmind core – each Geoshan is a cybrid before it takes its first chittering breath. Literally engineered for a specific caste, steel and flesh carefully paired, only hard work and rigorous self-modification allow Geos to escape their role. Such individuals are rare, not least because a Geoshan's mindset is as factory-assembled as the rest of their existence, welded together from fragments of each hive's archive of great dataminds. The highest honour a Geoshan can aspire to is becoming a template for the future construction of its race, its unique signature added to the distilled chemical samples of its ancestors, to be mixed into the genetic slurry that fuels the Queen's latest batch.
The sight of a Geoshan vessel descending briefly on a planet is a welcome one to those in poor or war-ravaged sectors, for the Geoshii sell their droid-labour and expertise in engineering cheaply, even if outsiders often have trouble telling droid from drone. More profitable systems regard them as cosmic dung-beetles at best, eager to remove great mountains of hazardous waste and unwanted scrap. More often, they treat them as opportunistic thieves willing to devour asteroid fields, pollute pristine dwarf planets, and steal entire moons in search of unclaimed ore.
Such disagreements see overwhelming but subtle pressure placed on the hive-moon to move along, for few governments want to start a war with a race of innumerable and unnerving weaponeers. The Geoshii skill at blurring the line between organ and engine has produced walkers of uncanny speed and maneuverability, fighters capable of moving at dizzying angles, and symbiotic strategists that calculate odds with ruthless efficiency. Geoshans do not view mortality in the way of human-likes, and some claim that high-ranked Geoshans possess a form of immortality alien to the ways of the Jedi Lords, their minds preserved in the buzzing honeycomb of information at their cybermoon's core.
All in all, bribes or blackmail are usually regarded as wiser tools for turfing out an unseemly cybermoon. The extent to which the Queens intercommunicate is unknown, after all, but none wish to see their sky blackened by humming moons that bristle with lasers and crawl with semi-mechanical life.