The butcher of the forest Tordotcom, Tor Publishing Group

"At the northern edge of a land ruled by a merciless foreign tyrant lies a wild, forbidden forest ruled by powerful magic. Veris Thorn--the only one to ever enter the forest and survive--is forced to go back inside to retrieve the tyrant's missing children. Inside await traps and trickery, ancient monsters, and hauntings of the past"--