Sin



In Final Fantasy 10, Sin is a monster the wreaks havoc on the land of Spira. The only way to defeat Sin is to turn someone into a Fayth, and have them attack Sin. This, however, is only a temporary fix, as Sin will resurface ten years later, with the person who became the Fayth as its "controller" more or less. In the game, Sin returns as the main character's father, Jecht. Jecht can control Sin, but only when he hears the Hymn of the Fayth.