There are a ton of spells in the Wizarding World of "Harry Potter," all of which (obviously) do vastly different things. Some, like "Expelliarmus," will disarm your enemy in battle. Meanwhile, "Accio" summons an object towards you, "Wingardium Leviosa" makes things float, "Alohomora" opens (most) locked doors, and "Avada Kedavra" will kill a grown witch or wizard on the spot. So, what is the Patronus charm (which uses the incantation "Expecto Patronum")?

Alongside all of the spells, there's a whole host of magical creatures in the Wizarding World, and the darkest among them are dementors: soul-sucking, faceless, hooded ghouls who guard the isolated wizard prison Azkaban. The only way to fend off dementors is by using your Patronus, and unlike most spells, the Patronus Charm is completely unique to each witch and wizard who uses it. Take, for example, the eponymous Boy Who Lived, Harry Potter (played in the original...