Harrison Peverell: Imperator Mortis

Harry James Potter: the only one with the power to survive the impossible. But what is this power? Love? Sacrifice? Magic most unknown? Or could there be a much darker, more-terrifying truth to it? If the Killing Curse didn't kill him, what did it do? Evil Godlike Harry/Tonks/Luna/Fleur (RATED M FOR A REASON: SEE FIRST CHAPTER FOR WARNINGS!)