The Promised Ones. The Milward Chronicles, #1

He is the last of the wizards. Milward survived the Magik Wars by the narrowest of margins. Just beginning his life among the magik users, his teacher was blasted into nonexistence by Gilgafed the Sorcerer during the fighting and he had to learn about this power on his own. As history has it, he became friendly with the enigmatic race of dragons, gigantic creatures able to smell magik, and, according to myth, once sailed the stars.
Befriended by Labad, the last great Emperor, Milward became the one to watch over the royal household until Labad's prophecy is fulfilled. Heroes become legend. Legend becomes myth and empires decay as most men fail in their oaths. Sorcerers never forgive. Adam and Charity are about to find themselves in the middle of events that will shake the foundations of the empire. Moreover, if Labad's prophesy is right, the twins are the only ones with the power to save the world from annihilation.
Milward has read the prophecy, he thinks. He has a copy, but the original has been lost for over a thousand years. That remains hidden with the dwarves, a people who would not share a secret if their lives depended on it-and it does. The original is given to the twins, along with Labad's weapons, and, though they don't know it yet, his abilities. Gilgafed is aware of this. It was partly due to his machinations that the empire crumbled.
He plans to complete that destruction at all costs. The twins have to live if the empire is to survive. The barrier between this world and the shadow is beginning to thin, and Adam and Charity must face all the terrors the Sorcerer can bring to bear while Milward is forbidden to interfere.