This place is the junction of the three-dimensional world, or let me put it more clearly, it is the junction of time and space. People from any time and space may gather here, and you may even meet your future or past self here.
Of course, it didn't start out that way.
The formation of the World Tree originated from the wars in the Chaos Period.
Humans, gods, orcs, monsters, evil spirits, demons... All the races you can imagine participated in this melee.
Concept: caught between time and space, traveling in the outer world