Cart and Cwidder (The Dalemark Quartet, #1)

For centuries, Dalemark has been a land divided by the warring earldoms of the North and South. Now, with the help of the Undying, the mysterious gods of Dalemark, four extraordinary young people -- from the past, present, and future -- must join forces to reunify their beloved land. When Moril inherits his father's prized instrument -- a Cwidder said to have belonged to one of the Undying -- he must learn to harness its strange power in time to prevent a destructive civil war.