Um, well, I've come up with a new story about this girl named Joan. The setting are lands that are separated into two factions: Light and Dark. The Light uses Light Knights as its armed force and Dark uses Dark Knights as its armed force. Each side is in conflict with each other, but they more or less leave each other alone unless one bothers the other. Unfortunately, there's a plan to create a war between the two being orchestrated in the shadows. A knight is only capable of using one element, but Joan can use both, which makes her very powerful and a living target. She's also masquerading as a boy to join the Light Knights, so if they ever found out that she was a girl and that she could use Dark Arts, her future would become very grim. There is a limitation to her condition though: each time she uses one element, it becomes stronger and the other becomes weaker. So, if she used a Light Art, her Dark Arts would become weaker and her Light Arts would become stronger.