The Carbonfras is a boss that was added on November 3, 2019/2020. Currently, it is on the TESTBED bosses branch.
Design
Carbonfras has a silver hexagonal base with an "Eye" in the center. "Eye" has a shape of a black circle and a dark dark red circle inside. "Eye" faces wherever Carbonfras is currently moving. On the corners of its base, Carbonfras has six more "Eyes", which are smaller in size and have a slightly lighter color. On each side, Carbonfras has a Railgun auto-turret and on each edge, Carbonfras has an Assassin auto-turret. All auto-turrets have a silver base and a red fill.
Technical
Carbonfras a low speed, large size and medium health, and always spins. Its assassin turrets have a pretty low rate of fire, but high bullet speed, damage, and penetration. Railgun auto-turrets have a surprisingly high rate of fire, twice faster than normal railgun, high bullet speed, damage, and penetration.
Spawning
Currently does not spawn.
Countering
Carbonfras has a high firepower, mainly due to its railguns, and can easily kill most normal tanks very fast. Its bullets have decent spread and high damage, so you will not stand a chance by yourself against Carbonfras. Although the boss is strong, there are still ways of defeating it.
One way is by using Redistributor and utilizing the large size of the boss. Your bullets will deal quite a lot of damage, and you can keep a safe distance. Most of the time you should hide behind an obstacle, then slightly move away from it, should Carbonfras and repeat. You will likely hit the boss due to its large size, so repeat the procedure until the boss is dead. Using Incognito is also a very effective way to kill this boss.
If you are in a team with another player, you can out-gun the Carbonfras. Firstly, you should both choose tanks with very high penetration and rate of fire. Secondly, you must attack from a single flank, so make sure you can trust your teammate. You will be able to penetrate most of Carbonfras's bullets, while some of your bullets will hit the boss due to its large size.