Sage's Moon. The Moons of Epigaea, #1

The world of Epigaea is old and filled with promise and peril. In their pride and arrogance the magic-wielders of old unleashed a storm so powerful that Epigaea herself rebelled and rose against them. The Great Storm decimated those who would conquer her then set loose creatures of shadow, twisted caricatures of those wanton spell-weavers, to devour any who dared survive. Now, over two thousand years later, Mankind has again grown but this time in fear and humility.
Those few left after Epigaea's rage now know respect for the world they inhabit. In the small village of Brookvale on the edge of lands yet untamed three children grow, through happy times and sad, in their journey to adulthood. Then... disaster! Monsters of legend ride the night's shadows in to capture and kill all who dare live in the lands they wish to hold. By wit, by will and by sheer luck these children, Thorne, Elaine and Sven, survive that awful night. But is it luck alone? Now grown and making their way through a huge and heartless world these three discover an ancient evil bent on consuming the souls and magic of Epigaea herself.
This unstoppable darkness must be stopped but they have only themselves to do it.