over zenith

Japanese title: OZ -オズ(Ozu)-
European title: The Sword of Etheria
Korean title: 체인즈 오브 파워 (Chains of Power)

An action RPG/Hack N' Slash developed by Konami on 2005 for PlayStation 2.
Some characters are loosely based on The Wizard Of Oz. In the story, "OZ" is an abbreviation for "OverZenith".