With the final Harry Potter movie continuing to slaughter records at the box office and the shirtless circus known as the Twilight series set to wrap up within the next twelve months, the search is on for the next big fantasy film franchise. Having franchise on your production slate that guarantees an annual billion dollar box office/DVD gross looks pretty damn good to studio execs, so they’re constantly on the look out for the next film series that will make magic-loving tweens squeal with delight. That’s why Warner Brothers acquired the screen rights to Deborah Harkness’ debut novel A Discovery Of Witches today. The book is the first part of a trilogy that features witches, vampires, and swooning. In other words, there are a few Warner Brothers execs in an office somewhere salivating over projected box office grosses right now. Hit the jump for more info on the potential franchise.