The Imperturbable Charm (incantation unknown) was a charm that created an invisible magical barrier around an object, such as a door. Objects would bounce off of the barrier, and it also muffled sounds, like the Muffliato Charm. An object enchanted in this manner was said to have been "Imperturbed". During the 1989–1990 school year at Hogwarts School of Witchcraft and Wizardry, Bill Weasley taught this charm to sixth year students in Defence Against the Dark Arts class as part of his extra-curri
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