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The Intruder Charm (incantation unknown) is a spell which detects intruders and sounds an alarm, the magical-equivalent to a burglar alarm.

History

Horace Slughorn used it on a Muggle-owned house he stayed in temporarily in 1996 in Budleigh Babberton, but did not hear it go off when Albus Dumbledore and Harry Potter arrived because he was in the bath.[1]

Behind the scenes

Appearances

Notes and references

  1. Harry Potter and the Half-Blood Prince, Chapter 4 (Horace Slughorn)
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