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Intruder Charm

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The Intruder Charm (incantation unknown) is a spell which detects intruders and sounds an alarm, the Muggle-equivalent to a burglar alarm. Horace Slughorn used it on a Muggle-owned house he stayed in temporarily in 1996 but did not hear it go off when Albus Dumbledore and Harry Potter arrived because he was in the bath.

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