The Baten Kaitos series takes place in a world where humanity lives on a series of island-nations in the sky. These islands are the last livable remnants of a poisoned Earth that was devastated a thousand years ago in the War of The Gods. The residents of the sky however are prosperous having been aided by various advantages, including Wings of the Heart- the manifestation of the human spirit in the form of usable wings-, Magic, Magnus- a technology that allows the essence of an item to be stored within small card-like objects-, and Machina- mechanical technology. Their way of life however is in danger as the ancient Gods power begin to return and threaten the world.