Sixty years after the unicorns' narrow escape from extinction, Azaria's Legacy has gone wrong. The new generation barely exists, hidden in the depths of the forest. Their cruel and ruthless leader, Icarus, threatens them daily with Jaresh, an invisible being capable of taking away their powers. Angry, the young colt Ulysees and his friend Téo rebel, following an old, abandoned trail where they're discovered by humans. Now the entire herd must flee. But Ulysees learns there's a far greater danger than humans when he meets a giant creature who warns him of impending doom.