THEORY: The Marauders probably reverse engineered existing Hogwarts magic
I’ve been sitting on this theory for ages: what if the Marauders didn’t actually invent the Map’s magic from scratch, but tapped into existing Hogwarts enchantments .. specifically the Quill of Acceptance and Book of Admittance?
The Map instantly knows everyone’s identity and location. That seems like absurdly sophisticated. Four students creating an effectively Dark object with apparently none of the usual drawbacks? It feels less like genius invention and more like they figured out how to reverse engineer or piggyback off ancient Hogwarts magic that was already there. The Marauders were ridiculously talented, so I can buy that they’d crack an existing enchantment. I just can’t fully believe they built this from nothing (and I donttt believe it’s a joint horcrux, that theory doesn’t make sense to me)
Has this ever been ruled out? Is there anything in canon that breaks it?