The Voyage of the Jerle Shannara #1-3: Book Series by Terry Brooks
The 3-book set of mass market paperback novels includes the below titles:
The Voyage of the Jerle Shannara: Ilse Witch (ISBN 9780345396556): When a half-drowned elf is found floating in the seas of the Blue Divide, an old mystery resurfaces. Thirty years ago, an elven prince led an expedition in search of a legendary magic said to be more powerful than any in the world. Of all those who set out on that ill-fated voyage, not one has ever returned. Until now. The rescued elf carries a map covered with mysterious symbols–and Walker Boh, the last of the Druids, has the skill to decipher them. But someone else understands the map’s significance: the Ilse Witch, a ruthless young woman who wields a magic as potent as his own. She will stop at nothing to possess the map–and the magic it leads to.
The Voyage of the Jerle Shannara: Antrax (ISBN 9780345397676): Now in Antrax, as the crew aboard the airship Jerle Shannara is attacked by evil forces, the Druid’s protégé Bek Rowe and his companions are pursued by the mysterious Ilse Witch. Meanwhile, Boh is alone, caught in a dark maze beneath the ruined city of Castledown, stalked by a hungry, unseen enemy.
For there is something alive in Castledown. Something not human. Something old beyond reckoning that covets the magic of Druids, elves, even the Ilse Witch. Something that hunts men for its own designs: Antrax. It is a spirit that commands ancient technologies and mechanical monsters, feeds off enchantment, and traps the souls of men.
With the Jerle Shannara under siege and Antrax threatening the bold and unwary, the Ilse Witch finds herself face-to-face with a boy who claims to be the brother she last saw as an infant. Now a young man, Bek wields the magic of the wishsong and carries the Sword of Shannara upon his back. Unsure whether to trust Bek or to slay him, the Ilse Witch takes him prisoner. One has come pursuing truth, the other revenge. Yet both seek Walker Boh–with the fate of the Four Lands hanging in the balance.
The Voyage of the Jerle Shannara: Worgawr (ISBN 9780345435750): Now in Morgawr, the quest at last draws to its climactic conclusion, as the forces of good and evil vying against each other to possess an ancient magic race towards an explosive clash—and whatever fate awaits the victor . . . and the vanquished. Harrowing confrontations with the merciless Ilse Witch and the monstrous Antrax have already taken their toll on the intrepid heroes of the Four Lands. But their darkest adversary now snaps at their heels, in the form of the Morgawr—master of the Ilse Witch, feeder upon the souls of his enemies, and centuries-old sorcerer of unimaginable might.
With a fleet of airships and a crew of walking dead men at his command, the Morgawr is in relentless pursuit of the Jerle Shannara and the crew that mans her. For the Morgawr, the goal is two fold: to find and control the fabled ancient books of magic, and to destroy the dark disciple who betrayed him—the Ilse Witch. But the Ilse Witch is already a prisoner . . . of herself. Exposed to the awesome power of the Sword of Shannara, and forced to confront the truth of her horrifying deeds, she has fled deep into her own mind. Now at the mercy of those who seek vengeance against her, her only protector is her long-lost brother, Bek Ohmsford, who is determined to redeem his beloved sister . . . and deliver her to the destiny predicted for her by the Druid Walker Boh.