You know your Hogwarts House and your Ilvermorny House and your wand wood and core—now you can find out what your Patronus is on Pottermore, thanks to this new J.K. Rowling-approved personality quiz.

In the Harry Potter books, Patronuses are spells that take the form of animals that can ward off dementors; they're formed by thinking of your happiest memory. The quiz is a surprisingly gorgeous recreation of this process; you're supposed to think of that happy memory and then choose between words like "free" and "safe" based on instinct.

Sources: Pottermore