Fiendfyre
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Fiendfyre
The Fiendfyre Curse summons a raging fire composed of magical creatures. It is able to chase its victims down, and once consumed by the fire, all objects become completely burnt. The incantations to invoke Fiendfyre or remove it are unknown. Vincent Crabbe is known to cast Fiendfyre in the Seventh book while in the Room of Requirement, in an attempt to kill Harry Potter, Ron Weasley and Hermione Granger. Vincent Crabbe was killed by his Fiendfyre curse, as he was unable to control or end the curse once he had cast it. According to Hermione, it is one of the few magical substances capable of destroying a Horcrux, but further states that she would never have used it, as it's so unstable.
