The 10 Best Spells in Harry Potter (And Why They're So Awesome)
10. Expecto Patronum This charm spell is used to drive away Dementors and Lethifolds, first seen being used duringPrisoner of Azkaban. It’s said to be the most powerful defensive charm—so advanced that not all witches and wizards are able to conjure it. The spell can be conjured in two forms: corporeal (having a distinct form, especially that of an animal) and incorporeal (forming a shield with an indefinite figure from the tip of the wand)....