Mavolia

Mavolia is the name given to the netherworld of the Mana universe. Unseen and originally unnamed in the series' early works, Mavolia is said to be a place where demons and monsters reside. It holds unfathomable dark energy from which its denizens draw life and attempt to take hold of the many mortal realms sustained by mana. Said dark energy is so powerful that it is the very antithesis of mana power itself.