Dragon Strike. Book Four of the Age of Fire

A dark and riveting fantasy of three dragon siblings, from the author of The Vampire Earth novelsThe fourth in the Age of Fire series following Dragon Champion, Dragon Avenger, and Dragon Outcast... Scattered across a continent and scarred by their harsh experiences on the path to adulthood, the three dragon siblings are among the last of a dying breed, the final hope for their species' survival. After being separated by dwarf slave traders who found their nest, the three-AuRon, the rare scaleless gray; Wistala, the green female; and Copper, the embittered cripple-are reunited.
But their reunion is not a happy one, since the three find themselves at odds over the coming human war. AuRon thinks dragons should have no part in the affairs of humans. Wistala believes dragons and man can peacefully co-exist. And Copper has designs of his own on the world. And the civilized humans who have turned to Copper for assistance against their savage enemies have just given him the perfect opportunity to fulfill his plans.