Harry Potter and the Quest of the Undying Warlock

6th year AU: Dumbledore sends an owl to Harry telling him he is coming to pick him up, but his Uncle decides he's had enough of Harry's freakishness, just about the same time Harry decided he's had enough of his uncles' bullshit. That one choice leads to unexpected consequences and Harry will be faced with the choice of a lifetime; a choice he can't possibly decline.