Dark Legacy of Shannara: Witch Wraith (book 3)

For centuries, the Four Lands have been protected by a magical barrier from the dark dimension known as the Forbidding. But now the ancient wards securing the border have begun to erode - and the monstrous creatures imprisoned are poised to spill forth, seeking their revenge.

Young Elf Arling Elessedil possesses the means to close the breach, but has been taken captive. The only hope lies with her determined sister Aphen, who bears the Elfstones and commands their magic. Now the fate of their world rests upon her shoulders...