Introduction to the Defense Against the Dark Arts Classroom: Inside the Defense Against the Dark Arts Classroom, visitors can see the real images of the three protagonists on the terrace. Each Defense Against the Dark Arts teacher had been teaching for less than a year. Especially when Professor Quirrell was here, the classroom was filled with a strong smell of garlic. According to rumors, it was because he had offended a vampire and was afraid of being attacked. In order to oppose the "ugly" Umbridge, Harry, Ron, and Hermione created the Defense Society in the fifth grade, and Harry taught the members Defense Against the Dark Arts.