It was a medievil type movie. a boys father was killed in front of him and him and his brother were taken by the intruders. The older brother was selected to be apart  of this hunting thing I guess. the intruders gave the selected people some time to run before they drunk some stuff which made them faster i guess then chased them down and tried to kill them. There were maybe around 6 people that were released from the intruders and they only gave them a few minutes to run before they were chased down. the boy was able to get a hold of some of the white stuff then become “the wolf ” and killed the intruders. he made it back to his younger brother and the other prisoners and freed them and he gave them some of the white stuff too and they killed the rest of the intruders. I watched this movie in 2015. a quote in the movie was something like “to kill the wolf you must become the wolf” and that’s when the boy ate the white stuff. please help me!! it was a great movie and I can’t find it anymore 🙁