The Sword of Heavens series, written by Richard Tuttle, and available at Fictionwise, has 7 books in it. Fictionwise lists the books as Fantasy/Young Adult. They are a light read but very well written. The complete series is available in multiformat (with both LRF and ePub available).
The story centers around a group of young adults (referred to as the children) and an ancient prophecy that foretells their coming and the ability of a warrior king to unite the people and creatures of the world (unicorns, dwarves, elves, dragons, and fairies) in a fight against evil. Needless to say, there are mages and warriors, good and evil, in the series.
Although I am far from being a young adult (I can't even remember what those days were like
), I have enjoyed every one of the books in this series. Highly recommend it to fantasy lovers.