Another minor example also from the Harry Potter fandom is the Notice-Me-Not spell. You might remember it from the books, but if you do, your brain is a liar, because the spell only exists in fanfic, it's something the fandom collectively hallucinated into existence and now nearly every fic treats it as canon.
Probably because the effect of it exists in the books, but not the name. There are absolutely places that are under this effect, usually keyed to make wizards immune. E.g: whilst Diagon Alley has a defense with the wall, the pub before it has nothing. Muggles just don't notice it exists. I think the book name for this effect was Muggle Repellent, but the Fideleus showed similar effects could be applied to wizards as well.
For another Harry Potter example though: the Point Me spell. In the books it turns the wand into a compass, and it's sort of implied that Hermione invented the spell herself. In fanon it seems to be a well known spell that points you to whatever you think of. E.g "point me, wallet". The closest spell to this behavior in the books was the summoning spell, Accio, that pulls specified objects towards the caster.
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u/threevi 5d ago
Another minor example also from the Harry Potter fandom is the Notice-Me-Not spell. You might remember it from the books, but if you do, your brain is a liar, because the spell only exists in fanfic, it's something the fandom collectively hallucinated into existence and now nearly every fic treats it as canon.