This unit requires infiltration of an enemy Palace/Battle Lab/Atomheart to be built.
During the late stages of the Second Great War, the Allies were beginning to gain the upper hand over the Soviets. Conventional heavy tanks proved useless in countering the aircraft and nimble tanks of the Allies. Soviet engineers set out to design a truly unstoppable tank, one that could take on any enemy and still remain standing even after the mightiest blow. Unfortunately, the Soviets lost the war before the 'super tank' could be produced. The blue prints for the vehicle were quickly hidden and all prototypes were destroyed to prevent the Allies from gaining any more technological advantages. Once the Soviets were free from Allied occupation though, the idea of a 'super tank' had not been forgotten. Research into the project progressed steadily until the tank was complete and ready to be unleashed from war factories all over the Soviet Union.
However, in the end it turned out that the tank, now called the Apocalypse, was not very cost-efficient. Even with its amazing firepower and reasonable mobility, the modern Tesla Tank proved to be much more effective in battle. Thus the Apocalypse was reluctantly retired. While the Apocalypse can still be found in larger Soviet bases, the tank isn't actively produced. Some Soviet generals still keep a few models around for the nostalgia factor and the symbolic importance of the vehicle.
The Apocalypse Tank is equipped with twin 125mm Tesla-enhanced cannons, which are lethal to all armor and structures that might cross its path and the tank's many 'Mammoth Tusk' missile pods make this monstrous war machine a viable threat to aircraft and infantry. The idea of 'throwing everything you have at your opponent' is heavily incorporated in the Apocalypse as it will use all of its weapons at once against the enemy. Due to the incredibly sturdy turret fixated on the hull, the Apocalypse Tank can fire while on the move without losing too much accuracy.