Realm of Blood and Fire — Dionne Lister

The final exciting book in The Circle of Talia series. While the realmists watch, powerless to intervene, the gormons lay waste to Talia, city by city, moving closer to Vellonia each day. As the final battle nears, The Circle can't meet the conditions of the prophecy, and hope is dwindling. But even if they can unite Talia, the prophecy demands that someone will be sacrificed. Can Bronwyn and Blayke do what they must -- destroy those they love to save their world?