Yesterday, Pottermore (J.K. Rowling’s official site of information on Harry and his wizarding world) had hinted on the social media sites (Facebook, Twitter, etc.) that something new was about to be unveiled. That something new happened to be the opportunity to discover your Patronus. In the same manner as being sorted into a House at Hogwarts and Ilvermorny, Harry Potter fans will take a quiz to discover what their Patronus is.
According to Pottermore, there are many wizards and witches who are unable to produce a Patronus:
The Patronus is the most famous (and famously difficult) defensive charm. The aim is to produce a silvery-white guardian or protector, which takes the form of an animal. The exact form of the Patronus will not be apparent until the spell has been successfully cast. One of the most powerful defensive charms known to wizardkind, the Patronus can also be used as a messenger between wizards. As a pure, protective magical concentration of happiness and hope (the recollection of a single talisman memory is essential in its creation) it is the only spell effective against Dementors. The majority of witches and wizards are unable to produce Patronuses and to do so is generally considered a mark of superior magical ability.
So, click here to conjure your Patronus.
Mine is a St. Bernard dog! 🙂