The destroyer. As the name suggests, it can destroy stuff like MTTs easily with proper training.
About this creation
The aqua legion destroyer is a heavy firing boat. It is the biggest few-troop boat they have, and the turret ontop is not meant for shooting droids. It shoots 2 shots then takes 2 seconds to reload. The destroyers travel in groups, just like the patrol boats, and they are actually used as a patrol in areas known to get attacked alot, and are deployed the same exact way that patrol doats are, and the only difference in this case is that it has big guns on top. It is also used as a garrison for the battleships and the capital ship as cover fire if the battleships or capital ship is under fire.
The turret swivels and moves up and down.
A back view of the boat.
A side view. The Aquatic Marine is not sitting, he has his legs, but that 2x1 rectangular hole in the front is where he goes in.