Survivalist

The Survivalist is a Tier 5 tank that upgrades from the Crab at level 60.

Design
The Survivalist has two small Builder block launchers, that are positioned like a Dropship's. It also has two rectangular barrels, positioned like that of the Bumper.

Technical
The blocks fired from its side cannons are small, but extremely fast and has lethal damage. Along with its descent reload, and weird flying direction, it can ignore absolutely any bullet and kill enemy with one or two hits. The bullet, fired from upper part of main cannon, becomes a little more help. However, slow reload and poor stats (except its penetration and speed) of it makes it nearly useless.

Upon right-click, lower part of main cannon fires a nonagon with semi-transparent grey circle: a mini-base. It functions like decalibrator's block with trap launchers and very long lifespan. The mini-base does nearly no damage, and lets bullets go through it. And because it will stay in the same place until it is destroyed or lifetime is over, it is very bad to use mini-base as projectiles.

As the survivalist
Given a few seconds, the nonagon mini-base quickly deploys damaging field of tiny traps (similar to that of spiker) that temporarily blocks or significantly decreases fatality of enemy bullets. Plus, the reload of mini-base is high, repairing damaged trap field in a matter of seconds.

Combined with very high DPS ammunition and speed of survivalist, the mini-base provides perfect temporary base. So it is advised for survivalist to not leave the base, until it gets destroyed and you have to move it to somewhere else.

Overall, the survivalist is pretty well-balanced and is very good at fending off many tanks, while being as effective as circuit at killing the boss. Although you may need to get used to the tank to maximize its efficiency, it is surprisingly powerful if used with right skills.

Another method that I like is to place the mini-base as far into the out of bounds as possible, in the corner of the map, or between a bunch of rocks, Or both. Any way you can get the traps as compact as possible. Also probably keep the Weapon Speed fairly low for the same reason.

Against the survivalist
Try to lure Survivalist out of its temporary base, and avoid going near its mini-base at all costs. Although briefly, survivalist is semi-invincible inside it, and you might get hit by damaging trap launched by mini-base, which will guarantee to be fatal. However, survivalist itself is a bigger problem. Its blocks fly in really weird direction and is fast. Touching any of these blocks will give survivalist basically a free kill. Because of blocks, using fast tanks will surely be problematic; the speed of fast tanks might make you directly collide with survivalist's block. Sniping is also very hard, since the mini-base effectively defends sniper branch's bullets.

The only option is to use DPS tanks to penetrate its bullet barrage and kill it. It will require a good aim, though.