Children of the Sun and Moon - World of Melarandra, #1

Nearly 500 years ago, the Wizards War almost destroyed the world of Melarandra. The Order of Maget was created to ensure this never occurred again. For five centuries, they have destroyed any creature, or human, who possessed magical abilities. Even as this went on, a prophecy had foretold magic's return. Royal twins Koral and Eric Traven have known since they were children the prophecy pertained to them.
The prophecy told both were needed to complete the task of returning magic, but Eric has other ideas. Always wanting to go down in history as a great hero, Eric plans to do it alone. Now, as their sixteenth birthday approaches, the betrayal which the prophecy had foretold has occurred, setting everything into motion. Eric has gone off on his own, leaving Koral to scramble to find him. If they do not achieve the task set before them together, magic would return chaotic, and destroy the world as they know it.
Now, with the help of Gillock, a wizard from the old days, and beings which are no longer supposed to exist, Koral sets out into the Central Lands. Time is already against her and she wonders if she will find her brother in time, and more importantly, before the Order does.