The Tarragon Trilogy

Long ago, the dragons created the Key Keepers and Dragon Mages to help protect the world against the Revenants. Desiring more power, the Mage Circle, a corrupt group of mages, rose up in rebellion against them. After a bloody battle, the Keepers were exiled and the dragons were imprisoned inside the Mountain. The Kaida, the true leader of the mages, disappeared.
Hundreds of years later, Anwen Porter seeks to fulfill her father's dying wish by traveling to the Drakonii Mountains. There, she uncovers an age-old prophecy regarding the release of the dragons and the one who will restore balance to the world. Now Anwen must race to unravel all the clues and discover a hidden power from within because the Revenants are coming and they will stop at nothing to destroy the world.
Tarragon tells of the epic quest bequeathed to Anwen by birthright, and those friends who help her along the way: the mysterious Tyler; Courtney, the village flirt; and Walter, the military veteran.