Stabs in the dark here:
Caramon is a world ruled by Kuli, king of the Gods, currently a wasteland, with few people eking out a living in a hostile environment.
Fuak attempted to take the powers of Kuli unto himself, and in doing so, tapped the power from the entire world, obliterating all but the strongest forms of life.
The Dei (Latin root, God?) Demon has the power to sever Fuak's link to the powers of the world, and restore life.
Okay, maybe a little too Fantasia 2000, but there's my take...
And forgive me if my take on your world is horrible and corrupting, Tidus, but I did what I could with what we were given.