Guardian of the Balance., Merlin's Descendant, Volume One

Set against the backdrop of the magical time of King Arthur, a sweeping epic follows Merlin as he forsakes the old values and gives into temptation at the Beltane festival, where his daughter Wren is conceived, and Wren--blessed with the powers of ancient magic--must face an unimaginable evil to save Merlin, Arthur, and their world.