Or at least it tried to. This world, Thaerrathas, was torn asunder 500 years ago when hellfire rained down from the heavens and brought horrors from beyond the veil; Aberrations.
The old world was destroyed, now dominated by a barren wasteland filled with horrors from beyond the cosmos.
The sun crystallized and natural life withered, but something crept back into the world.
Ancient spirits of nature, Eidolons. These spirits began dwelling in the crumbling remains of ages past. Men and Beasts and Dragons and Plants and Stone. Vessels to house the ethereal forms of Eidolons, a new kind of life. Golems.
The world of Thaerrathas, is a realm of monsters, warfare, death, and spirits. It is a dying world where everything is clinging to the barest potential of continued survival. The setting consists of the planet Thaerrathas, its 6 moons, and several Planes. The planet of Thaerrathas is almost entirely a wasteland save for a few small pockets of life, the current area of focus are the lands of Gordia, which consists of the Sea of Silt, the Grottos of Gloom, and the Autumn Empire.
There are many intelligent Species on Thaerrathas, none of which are limited to certain lands or cultures. You can be anyone from anywhere.
Thaerrathas is a nexus, a place where beings from other worlds are brought. Strange inter-dimensional events and anomalies will rip people or creatures from their homes and bring them to Thaerrathas, these wayward travelers are known as Offworlders.
On Thaerrathas everything that is, is alive. Every rock and tree and creature and most other things that exist naturally in the world has a life, a spirit, and name. Most of these Spirits are dormant, lest the natural world is defiled.
Arcane Magic is considered a taboo with most people. What people know of arcane magic was learned from observing the horrors of the Aberrant Wastes. Many consider wielding the powers that brought Thaerrathas to ruin to be in poor form.
There are many Faiths on Thaerrathas, but gods of Celestial origin are things of a bygone era. Most people on Thaerrathas who practice faith instead worship Elemental or Monstrous beings from other planes of existence.
Hanging in the sky above Thaerrathas are 6 moons, connected to Thaerrathas through portals. Some people are from the moons as they are all inhabited by intelligent life.