Questions that deal with how the Fidelius Charm in the Harry Potter universe is presented and works. Use this tag with the [harry-potter] tag.

The Fidelius Charm is an immensely complex magical charm from the Harry Potter series that involves the concealment of a secret inside a single, living soul.

The charm is used several times throughout the books in various different ways and is key to some of the most crucial plot developments in the series, although it is never fully explained and remains somewhat of an unknown entity.

This tag should be used for questions that seek to explore the nitty-gritty details of how the Fidelius charm works and doesn’t work, as well as what information the books and other canon sources provide us with about the charm.