The Warrior Heir

The Warrior Heir is the first book in the Heir series by Cinda Williams Chima. It was published on February 27, 2007 by Disney Hyperion.

Synopsis
Jack Swift is a normal high school student, who loves hanging out with his friends, soccer, and girls. He has a serious disease and is required to take medicine for it daily. But when Jack forgets to take his medicine one morning, his whole world changes. Jack is a member of the Warrior Guild, a race of magic whose users are hunted are captured to be used in competition by the Red Rose and the White Rose. Jack must learn to master his ability, as well as avoid getting captured by one of the Roses to fight in a duel to the death.