World 「世界, sekai」 is a term often used to describe a universe.
Main types
Material worlds
Material worlds 「物質世界, busshitsu sekai」 are worlds with no spiritual and only physical elements.
Known material worlds
Demi-material worlds
Demi-material worlds 「半物質世界, han-busshitsu sekai」 are worlds with both spiritual and physical elements.
Known demi-material worlds
Spiritual worlds
Spiritual worlds 「精神世界, seishin sekai」 are worlds with only spiritual and no physical elements.
Known spiritual worlds
Other types
Chaos worlds
Chaos worlds 「混沌世界, konton sekai」 are worlds with unknown general characteristics, with only two worlds currently known.
Known chaos worlds
Heavenly Star Palace
Main article: Heavenly Star Palace
The Heavenly Star Palace 「天星宮, tensei kyū」 is a world isolated from all other worlds yet adjacent to them at the same time. It is the Place of Beginning where Veldanava first awoke at the beginning of creation.