The Mirror of Worlds - The Legends of the Oreth, #1

War looms in northern T'har, and with it the prospect of easy money for mercenaries and unscrupulous merchants alike. The promise of blood and gold lures warriors like the exiled dwarf Tryon Thunderslayer to Fort Dragon's Spine, one of a series of battlements near the border of Morvis, where he signs on as an axe-for-hire. When the dwarf's small company of mercenaries is betrayed by one of their own, a series of events unfolds that draws the band deeper into a regional conflict created to cover up and draw attention away from the reintroduction of dragons to the world.
The key to stopping the draconic invasion lies in these unlikely heroes and whether or not they can find the portal that allows the great wyrms access to the Oreth: The legendary Mirror of Worlds.