The Nubertron is the ultimate form of the Newburtron V1 its health is 168 so it'll plow everything in its way, but has limited endurance since it only has 72 energy and 3 regen and all its weapons use 8 energy.
Nuber slug gun
Nuber Laser pointer
Nuber laser Blaster Nuber optics
Trivia: In the 2nd Mechquest anniversary you can buy the Silver , Gold , and ( SC only ) Platinum Nubertron