The Elite Borer is a boss that was added on August 17, 2018.
Elite Borer has a pink triangular base with a Pounder auto-turret on top, Borer turret in front, and very short Machine Gun thruster at back. On the sides, Elite Borer has two auto-Borer turrets, each without a trapezium base.
Elite Borer has medium speed and health, as well as decent penetration. Its machine gun thruster has high penetration and damage and helps the boss to slightly propels itself forward. Its side borer turrets are pretty strong, have medium penetration and damage, and high rate of fire. Its front borer turret has less damage and penetration. Pounder turrets fired strong bullets that have high damage but a low range.
Spawns by a randomizer.
Elite Borer has a high rate of fire, yet somewhat mediocre penetration. Tanks that deal focused fire, like Streamliner or Machceptionist can out-penetrate this boss. In order to do so, you must maximize your bullet penetration and health, and move in a left-right pattern when fighting this boss. This way, you will ensure that Elite Borer will miss a lot of bullets while you will deal high damage to it. Pounder turret may slightly slow down the process, so spreading your bullets is also effective.
Another way of killing Elite Borer is finding an obstacle, be it a rock or wall, picking a drone/minion/Engineer branch tank, and start circling it around the rock. While staying on the opposite side, you will deal damage to the boss while keeping a safe distance.