First King of Shannara (The Original Shannara Trilogy #0)

Horrified by the misuse of magic they had witnessed during the First War of the Races, the Druids at Paranor devoted themselves to the study of the old sciences, from the period before the collapse of civilization a thousand years before. Only the Bremen and a few trusted associates still studied the arcane arts. And for his persistence, Bremen found himself outcast, avoided by all but the few free-thinkers among the Druids.
But his removal from Paranor was not altogether a terrible thing, for Bremen learned that dark forces were on the move from the Northlands. That seemingly invincible armies of trolls were fast conquering all that lay to their south. That the scouts for the army--and its principal assassins--were Skull Bearers, disfigured and transformed Druids who had fallen prey to the seductions of the magic arts. And that at the heart of the...