"The Dark Arts are never fixed. They evolve, changing over time. If you are not careful and persistent, they can easily overpower you. In my class, I will hone your skills." He moved over to several of the portraits and spell descriptions. "Your defenses will be strengthened, but they will also be flexible. In a world where Dark magic is used heavily, you must remain as quick as the arts you wish to undo. These portraits," he motioned to the various images of curse and dark magic effects on a person, "are a fair representation of what happens to those who suffer under the dark tide of the Dark Arts."