Tales of the World: Radiant Mythology

The world of Terresia is under assault by a "devourer", which seeks to consume its mana and leave it barren. Although the residents of the planet are unaware, this is actually a result of the actions of two entities named Widdershin and Aurora, the descenders of other worlds.

As a last resort, the world's life-giving tree (the World Tree) uses the last of its power to create a defender - the player's own character. The hero, after being awakened by a strange creature named Mormo whose own world was destroyed by the same threat, learns of the danger to this world's World Tree.