The Dark Legacy of Shannara #1-3: Book Series by Terry Brooks
The 3-book set of mass market paperback novels includes the below titles:
Wards of Faerie (ISBN 9780345523488): Tumultuous times are upon the world now known as the Four Lands. Users of magic are in conflict with proponents of science. The dwindling Druid order is threatened with extinction. A sinister politician has used treachery and murder to rise as prime minister of the mighty Federation. Meanwhile, poring through a long-forgotten diary, the young Druid Aphenglow Elessedil has stumbled upon the secret account of an Elven girl’s heartbreak and the shocking truth about the vanished Elfstones, which once warded the lands and kept evil at bay. But never has a little knowledge been so very dangerous—as Aphenglow quickly learns when she’s set upon by assassins. Yet there can be no turning back from the road to which fate has steered her. Whoever captures the Elfstones and their untold powers will surely hold the advantage in the devastating clash to come.
Bloodfire Quest (ISBN 9780345523518): The quest for the long-lost Elfstones has drawn the leader of the Druid order and her followers into the hellish dimension known as the Forbidding, where the most dangerous creatures banished from the Four Lands are imprisoned. Now the hunt for the powerful talismans that can save their world has become a series of great challenges: a desperate search for kidnapped comrades, a relentless battle against unspeakable predators, and a grim race to escape the Forbidding alive. But though freedom is closer than they know, it may come at a terrifying price.
Back in the village of Arborlon, the mystical, sentient tree that maintains the barrier between the Four Lands and the Forbidding is dying. And with each passing day, as the breach between the two worlds grows larger, the threat of the evil eager to spill forth and wreak havoc grows more dire. The only hope lies with a young Druid, faced with a staggering choice: cling to the life she cherishes or combat an army of darkness by making the ultimate sacrifice.
Witch Wraith (ISBN 9780345523549): For centuries the Four Lands enjoyed freedom from its demon-haunted past, protected by magic-enhanced borders from the dark dimension known as the Forbidding and the profound evil imprisoned there. But now the unthinkable is happening: The ancient wards securing the barrier between order and mayhem have begun to erode—and generations of bloodthirsty, monstrous creatures, fueled by a rage thousands of years in the making, are poised to spill forth, seeking revenge for what was done to them.
Young Elf Arling Elessedil possesses the enchanted means to close the breach and once more seal the denizens of the Forbidding in their prison. But when she falls into the hands of the powerful Federation’s diabolical Prime Minister, her efforts may be doomed. Only her determined sister, Aphen, who bears the Elfstones and commands their magic, has any hope of saving Arling from the hideous fate her captor has in store.
Meanwhile, Railing Ohmsford—desperate to save his imprisoned brother—seeks to discover if his famed but ill-fated ancestor Grianne is still alive and willing to help him save the world . . . no matter the odds or the consequences.