LF story where Harry's power is "he knows not"

I've been looking for this story for a while. I remember it being a time-travel fic where Voldemort was resurrected but ended up horribly disfigured or less powerful than intended or something. This concludes (iirc) with Harry getting kidnapped and Voldemort going through another ritual where he stabs himself to transfer his spirit to a new body. However, since Harry (and The Gang or whatever) had already gotten rid of the horcruxes, Voldemort killed himself with the knife-stab. Ultimately it concluded by Harry's Pairing (I think Daphne) claiming that the prophecy was more literal than thought, i.e., that it was "… power**.** He knows not."