(Polynesian?) island gets invaded by westerners looking for gold. One young villager resists, they murder his family and blinds him. He escapes and gets trained by a master. Harvests “iron weed” from the side of a volcano, to use as weapons. Seeks revenge.
Can not for the life of me remember the name of this movie…
Four Iron Men (1977)? https://www.youtube.com/watch?v=mi5R-g0Ntgg
– celebes.warty.pig