The Rift War (Zygradon Chronicles 5)

Emrillian Warhawk has been raised in the modern world, 2,000 years away from the Lygroes, hidden inside a dome of Threads. Now, she must return via the tunnel under the sea, to retrieve Braenlicah, find the lost Zygradon, and awaken Athrar Warhawk from his enchanted sleep to defend Quenlaque, Lygroes, and the world.

An enemy and a war have arrived that could destroy all the Threads and magic itself.