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In the movie adaptation of Harry Potter and the Deathly Hallows, Part II, we see Crabbe manage to unleash the Fiendfyre, ultimately destroying the Room of Requirement in the process. At least in the movies, this is some of the most powerful magic we've seen from anyone, and the only thing that comes close to it - maybe even secondary to it - is the inferno that Dumbledore himself creates to escape the Inferi in the Half Blood Prince movie. For what it's worth, that fandom.com wiki claims:

The curse was advanced dark magic, and it was one of the few known substances capable of destroying Horcruxes.

How was Crabbe able to unleash what looks like the most powerful (or at least destructive) spell used throughout the movies?

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    How do you know it is powerful to make the fire? Like real life, any idiot can start a fire, the power is in controlling it (personal headcanon). To back it up, Hermione says how she would never have used it because it is tricky to control, not cast. Jul 25, 2020 at 19:26
  • @marcellothearcane That could be the case, but I don't feel like that's what we've seen from how the movies (and the books) approach magic. It feels like there's generally been a clear positive correlation between the power/destructiveness/impressiveness of magic and the skill required to perform it. I could be wrong though.
    – Prometheus
    Jul 25, 2020 at 19:30

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Crabbe appears to be a pretty fair wizard, at least when it comes to using dark magic. He was able to cast an Avada Kedavra at Ron a few seconds earlier with no evident difficulty.

Crabbe wheeled round and screamed, ‘Avada Kedavra!’ again. Ron leapt out of sight to avoid the jet of green light. The wandless Malfoy cowered behind a three-legged wardrobe as Hermione charged towards them, hitting Goyle with a Stunning Spell as she came.

Harry Potter and the Deathly Hallows

Latterly Harry surmises that Crabbe must have learned how to (inexpertly) cast the Fiendfyre curse from the Carrows.

‘Fiendfyre – cursed fire – it’s one of the substances that destroy Horcruxes, but I would never, ever have dared use it, it’s so dangerous. How did Crabbe know how to –?’

‘Must’ve learned from the Carrows,’ said Harry grimly.

‘Shame he wasn’t concentrating when they mentioned how to stop it, really,’ said Ron, whose hair like Hermione’s was singed, and whose face was blackened. ‘If he hadn’t tried to kill us all, I’d be quite sorry he was dead.’

The Carrows were, of course, said to be teaching the Dark Arts to their students. Crabbe and Goyle were top of the class.

‘Amycus, the bloke, he teaches what used to be Defence Against the Dark Arts, except now it’s just the Dark Arts. We’re supposed to practise the Cruciatus Curse on people who’ve earned detentions –’

‘What?’

Harry, Ron and Hermione’s united voices echoed up and down the passage.

‘Yeah,’ said Neville. ‘That’s how I got this one,’ he pointed at a particularly deep gash in his cheek, ‘I refused to do it. Some people are into it, though; Crabbe and Goyle love it. First time they’ve ever been top in anything, I expect.

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