The 12 Spheres
The 500 are a terribly technologically advanced race that has chosen to live as simply as they can.
Each 500 is surrounded by a cloud of nanotechnology that responds to mental commands. literally anything they can imagine or can find a design for in their racial database they can create from the dust on the ground. This technology also continously regenerates them and keeps them healthy.
They are called the 500 because years ago they determined that was the optimum number for a community. So on various worlds throughout the multiverse there are small pockets of people, living by gathering fruit and nuts, but having access to vast power.