Tanequil - EN - Terry Brooks - Paperback

High Druid of Shannara book 2 of 3

The Shannara series overall, ungoing

Banished to the harsh mirror-world of the Forbidding, Grianne Ohmsford's only hope for rescue is her nephew Penderrin. But Pen is under siege as well. 

The treacherous druid who took Grianne's place seeks to ensure that Pen's magic will not help her return. To breach the Forbidding and bring Grianne back to the natural world, Pen has to journey into the dreaded region of Inkrim to find the fabled Tanequil and the talisman it alone can provide. No one but Grianne is aware, however, that her entry into the Forbidding allowed something dark to escape: a fearsome force long ago exiled has been let back in the natural world. 

She knows that this creature may be only the vanguard of a greater, more devastating invasion.