Born deep in the forest, far from the herd, Damien is kept a dark secret by his parents until his father, Samuel, decides the colt must join the other foals to be initiated. But the unicorns are horrified by Damien's birth defect. They see him as a freak despite his astonishing abilities.

Then when a rival shoves Samuel over the edge of the canyon to his death, Damien's talents turn deadly. Can anyone stop him before he destroys their world?