Kishalee
The Kish are now a primitive race descended from the Kishalee, an advanced race that once lived among the stars. They live among the ruins built by their ancestors on the planet Nejeor VI, ignorant of the power they once held.
History
The Kishalee civilization arose and flourished when Golarion was still in the stone age. One of their most important colonies was Nejeor VI, a gas giant with virtually inexhaustible natural resources, where kishalee colonists built floating cities among the clouds.
During the war between the kishalee and the Sivv, the resources of Nejeor VI were vital for the kishalee war effort. Eventually the sivvs created a superweapon named the Stellar Degenerator, but kishalee agents won the war by capturing the weapon before it could be fired. Bankrupted by the creation of the superweapon, the Sivv Dominion collapsed soon thereafter.
The kishalee then turned many resources to studying and understanding the Stellar Degenerator. In time the kishalee decided that they currently had no need for the Stellar Degenerator's destructive power, so it should be hidden away. Kishalee technomancers created a demiplane in which they could store the weapon, accessible only through a titanic structure called the Gate of the Twelve Suns, which was constructed far from the Nejeor system.
Years passed, and the kishalee came into conflict with other species. Though the Stellar Degenerator could destroy the home system of any opposing force, the kishalee only used it once, horrified by how it cursed worlds to orbit around a dead sun.
After thousands of years, the kishalee civilization eventually deteriorated. The colonists on Nejeor VI, cut off from their kinsmen and regular supply runs, either fled the planet, died out, or were forced to fend for themselves. Over the centuries, the survivors evolved into a less fragile subspecies, called the kish. The modern kish, a preindustrial society, have forgotten much of their people's history, achievements, and understanding of the scientific wonders they lived among.