The Elfstones of Shannara (Shannara Series #2)

In the far future, unbeknown to humankind, an apocalyptic war is brewing. Fearsome, vengeful Demons rage at the boundaries of the world, held at bay by a spell called the Forbidding. But now that barrier is dying. Evil is beginning to break through. And only the Chosen can banish the Demons back to their realm.
 
Wil Ohmsford is a healer, not a fighter; a man of duty, not great deeds. But this epic battle seeks him out, for he holds the Elfstones: mysterious protective talismans passe…