A slow but extremely durable tank.
Offense: These things have just about the highest armor and highest defense of any unit in the game but they are also about the slowest unit. It is best to get them as highly leveled as you can and let them lead the assault since they can take a long time to kill when fully promoted. Their gun is also very deadly to recon units and tanks too. It definitely takes skill to get them in at the right moment since most of your units will race past them if you deploy them too close together. Always support with anti air units if your enemy has helicopters. You can use units like these and the Janus in the front, medium-range units a little bit behind, and hard-hitting units like Gae Bulg, Revolution's Purity, or even a Great Bombard in the very back, in tandem with strong snipers and heavy helicopters, to make wreck out of a The Common Interest.
Defense: They have no air defense so use helicopters. They are very slow so if the enemy isn't pressing you save up enough resources to deploy 3 or 4 of your heaviest hitters to gang up on one of these tanks. Strong UR artillery are good against them since they can get a few shots in before it closes. Plan on using several units to bring these down and the higher the rarity the better when facing this unit. If the computer decides to keep these in the front and extremely powerful artillery in the back, you have to do your attack with one or totally without mistakes or else you will get owned.
Variant Specialty Edit
This is the long range variant but being ultra rare it also inflicts more damage and has a lot more defense. It is also by far the most expensive of the 3 variants.