The only way to repel them is by conjuring a Patronus, an “ancient and mysterious charm that conjures a magical guardian, a projection of all your most positive feelings.” ...

In the books, Harry's Patronus take the form of a stag, representing his father, while adversary turned hero Professor Snape's Patronus is a doe, a symbol of his long love for Harry's mother Lily.

Are you a stag? An otter? A rabbit? Maybe a doe? Now you can find out for sure. J.K. Rowling's Pottermore website announced Thursday that a new Patronus experience is live on the site, which will ...