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The engorgement charm in used on spiders multiple times in the series, proving it can be used on living things.

At one point, Ron states that he beileived Hagrid had been hit with an Engorgement charm as a child.

So, what would happen? Could the affected person actually be grown to a Hagrid-like size? If so, would they stay that way until it was reversed, or would it wear off?

  • Students learn Engorgio and Reducio at the same time, to avoid any adverse effects from something too large. (Can't remember if it's mentioned in the books, but it shows up in a video game written by JKR.) This suggests that perhaps it doesn't wear off on its own, although it could also be to prevent you from being attacked by a giant spider or something. – alexwlchan Nov 5 '14 at 11:07
  • youtu.be/QCPN3KmWEMA?t=6m39s – Valorum Nov 5 '14 at 11:13
  • i believe hermionie even uses reducio on her teeth, and it only mentions she did it once. though they never specifically say that is the charm she used she did reduce the size of her front teeth in book 4. – Himarm Nov 5 '14 at 14:08
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    im pretty sure it mentions it though i dont have the quote with me, harrys talking to her and suddenly goes,... hermione your teeth. and she says something about wanting to do it for ages but her parents where against it since they were dentists. she has buck teeth when first described in book 1 i believe, but that is what she corrects. – Himarm Nov 5 '14 at 14:45
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    @Himarm -- Malfoy tries to curse Harry with a Densaugeo spell and mistakenly hits Hermione in Goblet of Fire. Reducio is never mentioned by name. Hermione says, "‘Well ... when I went up to Madam Pomfrey to get them shrunk, she held up a mirror, and told me to stop her when they were back to how they normally were,’ she said. ‘And I just ... let her carry on a bit.’ So it was Madam Pomfrey who shrunk Hermione's teeth back to their normal, then smaller, size. Hermione was pretty pleased about this! :) – Slytherincess Nov 5 '14 at 17:07
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Ask Aunt Marge!

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While Harry's magic was involuntary, and it's not explicitly stated in canon, I would be willing to wager that some sort of engorgement magic was involved in blowing her up in Prisoner of Azkaban. She survived the engorgement, was properly punctured by the Accidental Magic Reversal Squad, her memory modified, and deemed fit to continue living her life as before by Cornelius Fudge.

Canon never implicitly states all the things that might happen when an engorgement charm is used on a human. We can deduce from Ron's comment about Hagrid is that it may be possible, at the very least, to do an engorgement charm on a half-human/half-giant. If this is possible, one would have to ask if it's Hagrid's giant blood that protects him from being injured or killed by the engorgement charm, or keeps the engorgement charm finite (i.e. Hagrid doesn't keep enlarging until he blows up!). Again, this is just an idea based on canon, as most examples of Engorgio are done on non-human subjects:

  • The twins placed an Engorgement Charm on the Ton-Tongue Toffee that they "accidentally" dropped in front of Dudley (GF4).
  • Kevin, the little wizard boy in the World Cup campground, was casting an Engorgement Spell (or something very similar) on a slug (GF7).
  • Hermione suspected that Hagrid has used an Engorgement Charm on his pumpkins (CS7).
  • The fake Moody used an Engorgement Charm on each of the three spiders he had bought to class to demonstrate the Unforgivable Curses (GF14).
  • Harry cast this on a spider to practice with his wand (DH20).

Thanks to the Harry Potter Lexicon (E Spells) for the above list.

Dudley Dursley's tongue didn't keep growing, although it got very long, after the twins fed him the tongue-ton toffee, so he didn't explode eventually, or die.

I conclude that engorgement charms can be used on humans, but with little harm done. Aunt Marge (I believe) and Dudley are all examples of humans surviving engorgement magic.

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    Wasn't Ron making that comment when he first learned that Hagrid was half-giant? Meaning that his now-defunct theory that an Engorgement charm was responsible for Hagrid's size did not take into account the effects of giant heritage. – numaroth Nov 5 '14 at 16:05
  • @numaroth -- Possibly? The OP didn't cite the quote, so I'm not sure which book it came from, so I don't know. But I did take Hagrid's half-giant heritage into consideration and noted it in my answer. Do you have further questions about it that you feel I should have specifically addressed? :) – Slytherincess Nov 5 '14 at 17:16
  • The "spell" used on aunt Marge didn't seem to be a normal engorgement charm. Nothing else that has the charm used on it reacts that way. – Winter Knight Nov 5 '14 at 18:18
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    @numaroth Is right. Chapter 23 of GoF: “I know there isn’t, but … blimey, no wonder he keeps it quiet,” Ron said, shaking his head. “I always thought he’d got in the way of a bad Engorgement Charm when he was a kid or something. Didn’t like to mention it. …” – Winter Knight Nov 5 '14 at 19:16
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    @numaroth - Thanks for explaining it differently. I get where you're coming from now. That's what I was trying to say about Ron's comment about Hagrid (again, not knowing the exact quote), but you say it much more succinctly. You should leave an answer! :) – Slytherincess Nov 5 '14 at 20:34
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In Harry Potter and the Cursed Child, Albus Potter and Scorpius Malfoy travel in time and use the Engorgio spell on Cedric Diggory during the second event of the Tri-Wizard Cup.

For the record, they initially thought about engorgio'ing only his head, but evidently settled on blowing his whole self up. Basically he turns into a balloon, in much the same way that Aunt Marge did in Harry Potter and the Prisoner of Azkaban

CEDRIC DIGGORY approaches them through the water, a bubble over his head. ALBUS and SCORPIUS raise their wands together and fire an Engorgement Charm through the water.

He turns and looks at them, confused. And it hits him. And around him the water glows gold.

And then CEDRIC starts to grow — and grow again — and grow some more. He looks around himself — entirely panicked. And the boys watch as CEDRIC ascends helplessly through the water.

LUDO BAGMAN: But no, what’s this . . . Cedric Diggory is ascending out of the water and seemingly out of the competition. Oh, ladies and gentlemen, we don’t have our winner but we certainly have our loser. Cedric Diggory is turning into a balloon, and this balloon wants to fly. Fly, ladies and gentlemen, fly. Fly out of the task and out of the tournament and — oh my, it gets wilder still, around Cedric, fireworks explode declaiming — “Ron loves Hermione” — and the crowd love that — oh, ladies and gentlemen, the look on Cedric’s face. It’s quite some picture, it’s quite some sight, it’s quite some tragedy. This is a humiliation, there’s no other word for it.

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