The Vile in Black Moss(1988)

Barkah and his son Seta intend on building a religious school in the remote area of Lumut Hitam (Black Moss). Unfortunately, the area is under the control of murderer / extortionist Tirta Ireng and his goons. After getting on their bad side, Barkah is killed and Seta retreats into the woods, where he encounters a man who can teach him the skills to get revenge.