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. He won't let them down. What would Harry do to save them all? Why-do what he always does, of course. Defy the odds, those pesky old gods, their rules and get back HOME. Time-Travel! Believably-Powerful Harry!