Aetherium - The Heart of the Cosmos, Holds the seven realms.
Caelum - The World of the Divine.
Corporum - The World of the Living.
Stygium - Styx, The River of Death, Separates the other realms.
Diluculum - The World of The Twilit, The Heart of Styx.
Interitum - The World of the Dead.
Infernum - The World of the Infernal.
Abyssum - The Abyss, surrounds and penetrates the Aetherium.