The Sword of Shannara - Terry Brooks (Book 1 of the Shannara Trilogy)

Long ago, the world of the Four Lands was torn apart by the wars of ancient Evil. But in the Vale, the half-human, half-elfin Shea Ohmsford now lives in peace - until the mysterious, forbidding figure of the druid Allanon appears, to reveal that the supposedly long dead Warlock Lord lives again. Shea must embark upon the elemental quest to find the only weapon powerful enough to keep the creatures of darkness at bay: the fabled Sword of Shannara.