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"It was not normal fire; Crabbe had used a curse of which Harry had no knowledge: As they turned a corner the flames chased them as though they were alive, sentient, intent upon killing them. Now the fire was mutating, forming a gigantic pack of fiery beasts: Flaming serpents, chimaeras, and dragons rose and fell and rose again, and the detritus of centuries on which they were feeding was thrown up in the air into their fanged mouths, tossed high on clawed feet, before being consumed by the inferno."
— Description[src]

Fiendfyre (incantation unknown) was a curse that produced enchanted flames of immense size and heat that were capable of destroying nearly anything in its path, taking the form of gigantic fiery beasts such as serpents, chimaeras, dragons, and birds of prey that seek out living targets.[1]

The curse was advanced dark magic, and it was one of the few known substances capable of destroying Horcruxes.[1]

Description and effects

"Fiendfyre — cursed fire — it’s one of the substances that destroy Horcruxes, but I would never, ever had dared use it, it’s too dangerous."
— The dangers of the spell[src]

Fiendfyre conjured by Vincent Crabbe during the Battle of Hogwarts, in the Room of Requirement

Fiendfyre was an immensely powerful fire that couldn't be extinguished by normal or enchanted water,[1] It was also very difficult for the caster to control,[1] flowing from their wand in a continuous stream of flame.[2] If the caster flicked their wand when the stream of flame was still running from it, a jet of fire would shoot off and become a flaming animal.[2]

When cast, the fire appeared with a roaring, billowing noise and gave its victims only a split-second's warning to escape, quickly consuming anything in the vicinity of its caster.[1] The flames were of an abnormally large size and take the shape of fiery monsters and beasts such as snakes, dragons, eagles, and chimaeras, constantly mutating into other beasts as well as powerful, formless flames that destroy all things around itself.[1] The fire even possessed a sentience of its own, a continuous (though far from latent) desire to burn anything it could.[1] It would pursue any nearby lifeforms and anything that it could destroy, and was capable of incinerating anything through mere contact.[2]

As Fiendfyre was inherently extremely dangerous, most casters would have major difficulty with controlling the fire once it had been unleashed.[1] There was also a charm to cease the flames, but unfortunately Vincent Crabbe never paid attention in class long enough to learn them, therefore costing him his life.[1] Casters with greater skill had an easier time controlling the flames.[3] It was unknown if the fire was able to burn off on its own.

Fiendfyre was one of the few substances known to be able to destroy a Horcrux. Hermione Granger was aware of this, but never considered the use of it against Voldemort's Horcruxes due to the inherently dangerous, uncontrollable nature of the spell.[1]

Known uses

Caster(s) Date Notes
Merula Snyde 1988–1989 school year Merula tried to teach Jacob's sibling this curse, however she lost the control of the fire until Patricia Rakepick came and managed to turn off the fire.[4]
Amycus Carrow 1997–1998 school year

Harry Potter speculated that Amycus was the one to teach Vincent Crabbe how to summon Fiendfyre.[1]

Vincent Crabbe 2 May 1998 Crabbe cast it during the Skirmish at the Room of Requirement while it was transformed into the Room of Hidden Things. He died in the ensuing magical inferno.[1]

Known practitioners

"Like it hot, scum?"
— Vincent Crabbe[src]

See also

Behind the scenes

Goyle dies in his own Fiendfyre

Appearances

Notes and references

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