There are a lot of Harry Potter spells that the average fan will know. Classics of the series like Expelliarmus, the Killing Curse, or the meme-worthy Wingardium Leviosa tend to be the ones that come to mind. From the lighthearted to those that are much darker, the series is home to countless spells. However, fans may not know much about one of the most important forms of magic in the series: love.