The Imperturbable Charm is a spell that creates an invisibile barrier around a target. Molly Weasley used this charm on the kitchen door at 12 Grimmauld Place to prevent the children eavesdropping on Order of the Phoenix meetings using Extendable Ears. Ginny Weasley was taught by Nymphadora Tonks how to test if something had been Imperturbed by flicking Dungbombs at the suspected target and seeing if they bounced off.
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Imperturbable Charm
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