Unicorns' Opal (Sword of Heavens #2) by Richard S. Tuttle
Series: Sword of Heavens, Book 2.
Approx. 120,480 words.
Published on March 22, 2009.
The Children have cleared the skies over Cordonia. The end of the Darkness in that part of the world has alerted Sarac to the location of the Children and his evil minions are converging on the Rangers. Follow the adventure of the Children of the Ancient Prophecy as confusion, doubt, and betrayal infiltrate their ranks and threaten to bring an end to the hopes of the world.