Scepter by Scott L. Collins

Daniel and Aidan have spent their lives apart from the rest of the kingdom of Castiglias and its subjects. For the last three years, they have been left with only each other for company since King Argyle's men came and took their parents to be slaves. The boys' survival has been dependent on the lessons learned from their parents, as well as their own unique powers.

When Argyle's men come to take Daniel, Aidan uses his little-known gift to fight off the gathering party. He does so with only two goals in mind: to save his older brother from a lifetime of serving Argyle, and then escape together. Fleeing the only home they have ever known, they must avoid Argyle's men, werewolves, and a fire-breathing dragon looking for an easy meal.

What begins as a fight to save one boy and then disappear unexpectedly turns into a battle against the evil forces of Argyle, a war that may affect the lives of not only the many children waiting to be taken, but the existence of the kingdom itself.