One thousand years ago three gods known as the Warring Triad who served as the source of all magic in the world started a conflict known as the War of the Magi. This quarrel released magical energy into the world, transforming any human touched by it into an esper, who were used as soldiers by the gods. Eventually repenting of the war, the Warring Triad returned free will to the espers and turned themselves to stone. Their only request was that the espers ensure their power remain sealed so that it could not be misused again.
