Gurhai

The Gurhai universe is not infinite. It is a geode: open space enclosed by an oval shell made of densely-packed organic and mineral detritus. There is a flat layer of sun systems that stretches length-wise in the very center of the shell. There are precisely one hundred worlds in the universe, separated into thirty-five sun systems; similarly, there are exactly one hundred sentient species in the universe, though not evenly distributed as one-per-world. All but two worlds in the universe are round and flat; Airdh (the First World) and Gurhai (the Last World) are the only spherical worlds, and they are at the far ends of the universe, a full year's travel apart. The suns are mobile and small, weaving or springing between planets in their systems, and there are no actual moons. In the top and bottom halves of the void, which are striated by the layer of worlds, there are creatures unlike any found on the worlds, living on the edges of atmosphere and gravity wells.