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- "The magic used in the map's creation is advanced and impressive; it includes the Homonculous Charm, enabling the possessor of the map to track the movements of every person in the castle, and it was also enchanted to forever repel (as insultingly as possible) the curiosity of their nemesis, Severus Snape."
- —Description of the magic involved in the map's creation[src]
The Homonculous Charm (incantation unknown) was a charm that, when cast onto a map, would enable its possessor to track the movements of every person in the mapped area, through labelled dots that moved around the parchment.
After charting the grounds and halls of Hogwarts Castle in the 1970s, on a piece of parchment that would go by the name of Marauder's Map, James Potter, Sirius Black, Remus Lupin, and Peter Pettigrew cast this spell on it, along with a charm to insult Severus Snape. This artefact proved quite useful to the foursome (commonly termed "the Marauders") through the years, until it was confiscated by Argus Filch in their final year at Hogwarts.
- "But the truly remarkable thing were the tiny ink dots moving around it, each labelled with a name in minuscule writing. Astounded, Harry bent over it. A labelled dot in the top left corner showed that Professor Dumbledore was pacing his study; the caretaker’s cat, Mrs Norris, was prowling the second floor; and Peeves the Poltergeist was currently bouncing around the trophy room."
"Homonculous" is a variant spelling of "Homunculus," which is a term used to refer to any representation of a human being.
Behind the scenes
- In the books, this spell causes moving ink dots to appear on the Map. In the films, they take the forms of footprints.
- Harry Potter and the Prisoner of Azkaban (First appearance)
- Harry Potter and the Prisoner of Azkaban (film)
- Harry Potter and the Prisoner of Azkaban (video game)
- Harry Potter and the Goblet of Fire
- Harry Potter and the Order of the Phoenix
- Harry Potter and the Order of the Phoenix (video game)
- Harry Potter and the Half-Blood Prince
- Harry Potter and the Half-Blood Prince (film)
- Harry Potter and the Half-Blood Prince (video game)
- Harry Potter and the Deathly Hallows
- Harry Potter and the Deathly Hallows: Part 1
- Harry Potter and the Deathly Hallows: Part 2
- The Wizarding World of Harry Potter
- LEGO Harry Potter: Years 1-4
- LEGO Harry Potter: Years 5-7
- Pottermore (First identified as Homonculous Charm)