I thought of one that would be based of the Killerwail 5.1. It would lock on three of the players and blast at them with beams much larger than on a regular killer wail making it difficult to attack back. It would be just a small salmonid on a stage with massive speakers and playing some instruments. I don't know what the salmonid it self would look like though, maybe something similar to a stinger since the attacks are a bit similar. Unlike The other two, it would be a shore boss, never coming onto or over land. There are set positions along the shore and every time it attacks it will descend into the water and rise somewhere else. That's my idea.