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|"Are you a wizard or not?"
The title of this article is conjectural. Although it is based on canonical information, the actual name is conjecture and may be supplanted at any time by additional information released from canonical sources. If this occurs, please move this page to the appropriate title.
The potion requires a cauldron large enough for a grown man to sit in as well as three crucial ingredients: bone unknowingly taken from the Dark Wizard's father, flesh willingly sacrificed from one of his servants, and the blood forcibly extracted from one of his foes. The remainder of the ingredients, if any besides water are needed, remain unknown.
As Voldemort noted the potion to be "an old piece of dark magic", it can be inferred that it has been used in the past by other Dark Wizards who suffered bodily damage. Therefore, Voldemort most likely did not invent it.
The use of Harry's blood in the potion, however, would come to be a mistake as it prevented Voldemort from killing Harry because the blood passed Lily Potter's protection to Voldemort and anchored Harry to the living world through him, ensuring the Dark Lord's defeat three years later. Voldemort believed, out of his lack of understanding love, that by using Harry's blood, it would allow him to bypass Lily's protection, when in fact it actually strengthened it.
Behind the scenes
- In LEGO Harry Potter: Years 1-4, Peter Pettigrew used Harry's glasses and Riddle's cranial bone, most likely to avoid violence. Instead of using a knife, Peter Pettigrew simply takes his hand off. When Voldemort is returning he wears Harry's glasses. Voldemort is sucking a dummy as a baby and lies in a pram. When he rises from the cauldron he already has his cloak on.
- In the novel, the bone was no more than a trickle of dust raised from Riddle's grave, and Voldemort rises from the cauldron while ordering Wormtail to cloak him. In the film, an entire bone that was already dug up was deposited into the cauldron, which catches fire and melts as Voldemort's body regenerates in mid-air and the cauldron's fragments become a robe and wrap themselves around Voldemort's body.
- In the film, the first line of the spell is also changed from "Bone of the father, unknowingly given" to "unwillingly given".