The Evil Amphibious Gillman is the dark version of Gill Grunt and one of Kaos’ minions. He is the second of three bosses at the end of Leviathan Lagoon. He and the other two minions must be defeated in order to collect the Eternal Water Source.
This dark version of Gill Grunt fires three harpoons at once from his harpoon gun. He is vulnerable when he stops to reload his weapon. He can also maneuver himself back and forth with his water jet-pack.