In the Harry Potter books, learning your patronus — a magical charm in the form of a spirit animal that wards off dementors — requires lots of hard work, concentration, and positive thinking. On Pottermore, though, it’s as simple as taking a quiz: On Thursday, the site launched a new feature where users can discover their patronus by answering a few questions. We don’t think this is quite what Arthur C. Clarke meant when he said that any sufficiently advanced technology was indistinguishable from magic, but it’ll do. If you’re curious, J.K. Rowling’s patronus is a heron.