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Specifically, if diary Tom Riddle had succeeded, how would he have strengthened the present day Voldemort?

In If diary Tom Riddle had succeeded, would there have been two Voldemorts?, @Pearsonartphoto gives a quote from J.K. Rowling in his answer regarding what would have happened if Tom Riddle had succeeded in fully manifesting from his diary memory form to a full human form.

Q: In Harry Potter and the Chamber of Secrets, what would have happened if Ginny had died and Tom Riddle had escaped the diary?

J.K. Rowling: I can’t answer that fully until all seven books are finished, but it would have strengthened the present-day Voldemort considerably.

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As well, I've read all seven Harry Potter books many, many times and I haven't been able to ferret out any overt details regarding exactly how the present day Voldemort would've been strengthened by co-existing with diary Tom Riddle.

Specifically, how would the reincarnation of 16-year-old Tom Riddle have strengthened the 67-year-old present-day Voldemort at the time of Chamber of Secrets?

★ I would love an answer from canon, any of J.K. Rowling's interviews, or Pottermore, or an answer constructed within the spirit of canon.

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I think this is one of those ones where JKR hadn't actually decided. One of those typical plot points where you realize the outcome of a henchman winning would be bad, but hard to correlate what gets added or detracted from the big picture. JKR seems prone to making things up as she goes in interviews. Not revealing something like that just gives her open creative license in successive works. Perhaps he would be strengthened in a negative sense... in that Harry's team would have been significantly weakened. –  Gorchestopher H Nov 26 '12 at 2:29
@GorchestopherH +1 for JKR ... making things up –  Windle Nov 29 '12 at 22:42

4 Answers 4

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I think it would also strengthen voldemort in the sense that he would have know not all of his horcruxes might be secure. He could have then increased security on them or outright relocated them. Also, the magic behind the horcruxes are not terribly well known. It is quite possible that by interacting with a sentient horcrux that he could have learned far more about this form of black magic. It has never actually been confirmed by Rowling though so this is all just speculation.

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Horcrux creation consumes a great portion of the mage's soul and energy. If Tom Riddle had emerged from the diary we can speculate that it will be some sort of Voldemort's soul and energy being liberated from the Horcrux itself. Once again in the real world, that energy will return to Voldemort... maybe nullifying the Horcrux?

The reason why Rowling hasn't answer at the point the question is made could be because Horcruxes weren't presented at that time in the novels?

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Once the piece of soul in the diary had grown strong enough, Voldemort would have used some means of resurrecting from that piece of his soul, considering that is what horcruxes are supposed to be for.

The piece of soul in the diary might have been dormant for a while, but after Ginny interacted with it, it grew on her fears.

It would have drained Ginny's life force to recreate it's own full self (it was only a piece of his soul). That piece of his soul had already gained control over Ginny. He could have undergone something like Goblet of Fire to re-enter a physical form.

This is all a bit speculative because exactly How someone restores themselves from a Horcrux is not discussed in the series itself, and the only incidence of this that we see, is in Goble of Fire.

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Horcruxes are not intended to be resurrected from. They are intended to prevent the owner from dying in the first place. –  trysis Nov 7 at 0:08
@trysis - yes. they are to prevent death. But Voldemort had figured out to restore himself in the physical form from a horcrux as evident in Goblet of Fire. –  ash_k29 Nov 7 at 5:56
Voldemort did not use a Horcrux to create his new body. Also, he already had a physical form (not sure where he got it from, but it wasn't from a Horcrux, either), he just used the "resurrection" potion to reform his original body. In fact, he did not touch or even see any of his Horcruxes (except Nagini) after he hid them. I don't think he ever even checked up on them, he just trusted his extremely powerful magic to keep them safe. –  trysis Nov 7 at 13:05

The diary was voldemort's first horcrux. A horcrux "splits a soul in two". That means, mathematically, the diary had the largest part of Voldemort's soul in it. It had half. The next horcrux he made would have had a quarter, the one after that one eighth, then one sixtheeth, and so on. By the end of the series, Harry had more of Voldemort's soul in him than Voldemort did (freaky, hey?).

Additionally, one of the main themes of the books is innocence and wholeness. Becoming whole would make Voldemort more powerful in that light, as well as doing so through Ginny who is symbolic of innocence and purity.

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