The Patronus is one of the most popular and most difficult defensive charms in the Harry Potter universe. The spell is cast when a person says, "Expecto Patronum," and for the witches and wizards who can cast it, a silvery-white guardian spews out of the wand taking the form of an animal.

The spell is used against Dementors and is said to be a cast when a happy memory is conjured giving them the strength to perform the spell. No one knows what form their Patronus will take until the first time it is cast, and it is also unlikely that the Patronus will change, although it has happened in the case of Severus Snape and Nymphadora Tonks.

As mentioned above, the Patronus takes the form of an animal. Will yours be a stag, like Harry and his father, James? A phoenix, like Dumbledore's? 

What is the true form of your Patronus? Do you have an idea as to what kind of animal it would be? Will it be an animal that represents your personality, or will it be one that reminds you of a person that is near and dear to your heart? If you would like to find out, then you can do so by taking this quiz!