Hachette Children's Book Chronicles of Ancient Darkness: Oath Breaker

When he was outcast, Torak was the hunted one. The following spring, he becomes the hunter when he swears to avenge the killing of one of his closest friends. To fulfil his oath he must brave the hidden valleys of the Deep Forest, where the clans have reverted to the savagery of an earlier time. Here, Torak finally learns why he is the Sprit Walker and discovers the true cost of revenge.