Overthinking Things

The Marauder's Map operated on an extremely complex principle. Although its search range was smaller than that of Muggle radar, it could precisely locate any target within its range.

First, it displayed names by using soul-marking magic to accurately identify each individual's unique magical signature.

The reason the SAS Tactical Dagger could appear as Lucy was that Vincent had given it a name, which produced an identifiable magical signature.

Next, the map could cover every known corner of the castle because its creators had used a spatial grid layout when drawing it.

It had been an enormous undertaking. Without Animagus transformations and the assistance of School Board Member privileges, there was no way they could have completed the drawing during seven years at Hogwarts.

Then came its ability to penetrate invisibility and disguises. That part used anti-invisibility spells and transformation detection, both more advanced than soul-marking magic.

The Black Family possessed countless magical books, and Sirius Black had only stumbled upon those two spells by chance.

Finally, combining the Revealing Charm with a trace-revealing spell allowed for real-time display and continuous tracking.

And to keep a certain nuisance from finding out, the map's creators had deliberately set up four separate personalities, along with anti-tampering spells and a password lock.

Once that nuisance spoke the password, even if it was correct, he would receive only false information—or be collectively insulted and cursed at by them.

Vincent listened to Sirius Black and Lupin's explanation with a frown throughout.

Applying so many different kinds of magic to a map no larger than a sheet of parchment without them conflicting, and having it still work normally twenty years later, required not only exceptional magical skill but also a measure of luck.

Vincent's brow relaxed slightly. "If you don't mind me asking, how many times