From Zelda Wiki, the Zelda encyclopedia
Militron the Berserker is an armored boss in Link: The Faces of Evil. He captured the Koridians and enslaved them in the process.
The Armored Pyrokinetic Militron is a minion of Ganon who possesses the ability to turn Koridians into stone monsters and attack Link by crushing them and exposing them to fire, much like when coal is turned to diamond by pressure and heat. When Link defeats Militron, his armor explodes revealing a fat old man. He is fought again in Ganon's lair. His in-game sprite is significantly different from his portrayal in cutscenes.