The Other Promise

Roxas' battle theme with a pic of his keyblade

I DO NOT OWN THE KH FRANCHISE

EDIT: Added a few annotations to clear up commonly asked question. They stop at about 1:45 so you don't have to keep staring at the picture of this Keyblade.
EDIT: The comments may contain conversation that branches into other areas of the Kingdom Hearts series. They could possibly be spoilers. Read at your own risk