Welcome back. I am pleased to see so many of you have returned, and I trust that you are prepared to resume your studies in Defense Against the Dark Arts. Last time, we delved into the annals of history and culminated our lesson with two spells of a rudimentary nature, which I trust were of little difficulty to you. This week, we shall be exploring two incantations of a slightly more sophisticated nature; however, I am confident that you shall prove yourselves more than capable. But first, we...