The Sword of Shannara Trilogy

In a world torn apart by war, a half-human, half-elfin Shea Ohmsford had found peace - until Allanon appears to reveal that the long-dead Warlock Lord lives again. The Elves and the Races of Man face ancient evil with the dying Ellcrys tree of long-lost Elven magic threatening to unleash hordes of Demons on Earth. Only the Elfstones of Shannara could save them. As the Ildatch, immemorial book of evil spells, stirs to life, Allanon seeks the help of a descendant of Jerle Shannara to stop the evil from stalking the Four Lands once again.