World

World (世界) is a term used to describe a universe.

Material World
Material Worlds (物質世界) are worlds with no spiritual and only physical elements.

Demi-Material World
Demi-Material Worlds (半物質世界), also known as Chaos Worlds (混沌世界) are worlds with both spiritual and physical elements.

Known Demi-Material Worlds

 * Central World
 * Homeworld of Hazy Style

Spiritual World
Spirirual Worlds (精神世界) are worlds with only spiritual and no physical elements.

Known Spiritual Worlds

 * Daemon Realm
 * Elemental Realm
 * Seal