RX-79[G]N Naudilus Gundam

The side skirts are actually very powerful attitude thrusters that help it with its blinding speed 

The knee thrusters also give it more control during dodging maneuvers 

On the custom backpack, are 4 thrusters along with the experimental flight system. These next-generation engines are powered by minovsky compact reactors, one in each. The super high output of this system can generate streams of charged particles from the exhaust. These super hot particles can act as large beam saber blades, slicing through enemy mobile suits and ships.

The Naudilus Gundam was developed by the Federation alongside the blue destiny units. When unit 2 gets stolen, the Naudilus was also in the container that housed unit 2. It was taken back to zeon and used later against the Federation forces