A discovery of the source of Rob’s essence leads him home. Now that Rob has progressed to dragon heart, he’s called upon to help the artic cats find their leader. The journey leads him deeper into a dangerous land, where he must find a way to stop the ice king and his servants. There he discovers the way to protect those he cares about is to head back to where he first learned of essence. What he learns is the true danger hidden until now—and the source of the Spread—but it might already be too late to stop it.