Cosmology (Suikoden Supplement)
From D&D Wiki
Among the stories of the world of Suikoden only three planes of existence have ever been described, although the existence of "many worlds" has been ascertained. The planes that have been mentioned are:
The Physical World
The world where all the humanoid races of Suiko hail from. This is where the main story takes place. This is a world ruled by runes and war.
The World of Wings and Scales
This is where all dragons hail from in the world of Suiko.
The World of Emptiness
This plane is where monsters and demons hail from. Runes such as the Gate Rune are able to summon monsters forth from this world. It is believed somewhere inside is the Eternal City, the final resting place of the Sindar people.