The Veiled Vestiges

AU. A slight deviation in the plans. A ripple broadening to destroy his whole world. A secret out in the open and fire rained from the sky. A world to save, an oath to keep. What would Harry do to save them all? Why-do what he always does, of course. Defy the odds, those pesky old gods and get back HOME. Time-Travel! Powerful Harry! Smart Harry! Politically Perspicacious Harry!