"The rules of Dungeons & Dragons, a worldview created by Western society, have been constantly refined by countless people, gradually achieving balance. It's a purely Western world of swords and magic, populated with humans, elves, dwarves, dragons, gods, ghosts, demons, devils… It's like a mishmash of different elements, but because it's continuously perfected and time has allowed knowledge to accumulate, this worldview has reached a state of equilibrium, resembling a real world.
In Dungeons & Dragons, there is a notorious place called the Abyss, an infinite realm of interconnected sub-planes, forming a vast and peculiar world. Each layer of the Abyss is a plane, a world unto itself, with different rules - some with more positive energy, others with more negative energy, or leaning towards elemental attributes like fire or water. It's essentially a grand world composed of countless smaller worlds.