ign.com/articles/2017/06/26/top-10-rpg-worlds-of-all-time

Unlike many planets of the solar system, Coroleya is a world within worlds. Each one formed into each other and unable to exist without the other.

Of these worlds, there are four.

There is the Underworld - Home of the demons. Once rulers of the Surface World, they feed upon souls for sustenance and power. But once every species on Coroleya became extinct. They brought forth races from out in the universe to feed upon, whereby they incurred the wrath of the Lightbearer, and began the Demon War that saw the demons retreat into the heart of Coroleya, now named the Underworld.

Surface World - The largest of four worlds, the Surface World contains all other worlds within it, and is the primary source of all magic. Linked to the Mother in some way, it releases magical flows of energy that give life to the world.

Darker Plane - A world that exists between that of the Celestial World and Surface World. The Darker Plane is home to magical entities that live between, half alive, half dead. They guide lost souls to the underworld or beyond to the Celestial Realm.

And lastly there is the Celestial World - Home to the most powerful of demonlords, and seen as gods by the dark mages, they stand watch over the worlds, use it’s inhabitants as pawns in their wicked games, and weave the fate of all that breathe. Even the Lightbearer’s power cannot reach them, and yet these fickle gods are more preoccupied batting each other for position and power.

Additional Note:

“...There is no greater horror in this world than to know that the monsters we fear most, lurk all around us. They who wait in the shadows, who watch our footsteps, are all around us, and they hunger for our flesh...”

Written by Yalendal, Scholar of Demonology.

Additional Note:

“I have travelled many paths in my life, but none has been more harrowing than my journey into the Darker Plane. In a world rife with magic, it is a living, breathing, entity that does not like intruders, and will fight wholeheartedly against those that try to force their way inside.”

Written by Galena, philosopher and adventurer.

Additional Note:

“When the Lightbearer first came to this world, he came to rescue his people from slavery. Stolen from their homes by demons to serve as their food. The Lightbearer chose instead to stay and fight. None, know where, or who he was, but his power was such, he birthed a New Age, one where the races of the world were free to rule.”

Written by renowned poet and scholar, Josephine Palain.