Tibera is the setting I created for the physical 5th Edition D&D campaign I’m running. Here’s the campaign setting for my online campaign, Itasoa, which I posted last week, which is a bit less of a traditional fantasy world.
Tibera is a stolen world. Five centuries ago, seven gods, tired of sharing their worlds with others, conspired to fashion their own world. They severed parts of other worlds, reforging and reassembling them into a world all their own at the farther ends of the multiverse, hiding it from any other gods. The souls of Tiberan dead are treated as currency by the gods.
The clouds of Tibera are like no others in the multiverse- each of them reflects the assorted afterlives ruled by the seven gods. If you look up on a cloudy day, you might see sculpted on the bottom of the clouds any of the assorted hells, heavens, or other afterlives of the Seven, with buildings, landscapes, and souls of the dead hanging above you.