Dorothy Must Die - Fanfiction

Hi, my name is Amy, Amy Gumm and I'm from Kansas. But lately I haven't been in Kansas, I've been in Oz training to be a teenage assassin. So far my instructor, Nox has been training me in combat and Gert has been helping me with magic. But there is a problem. I'm getting magic scars. Magic scars are these scars that you get after every time you use magic and burn every time you get new ones. They start at the back and then make their way to the head. If they get to the head, your future doesn't look so good. Dorothy got them and when they got to her head, well she turned evil. So Gert restricts my magic, mine are up to my shoulder blades now. Gert's the only one that knows, other than Mombi and Glamora. Basically everyone but Nox. I can't let him know because then he will think that I am weak and wont challenge me in training. Oh, and have I mentioned, my first thing on my list of things to complete in Oz, kill Dorothy.