Vis Ultima

Vis Ultima is a boss that was added with the release of the game.

Design
Vis Ultima has a green colored seven-sided body, very similar to Vis Destructica, only with a slightly larger gap in middle and large size. Between two wings of Vis Ultima, there is a triangle-shaped spawner, similar to trap spawner. In the front Vis Ultima has a turret. On top of each wing of Vis Ultima is an auto-twin turret, slightly longer than twin turret and an extra section in both barrels.

Technical
Vis Ultima spawns many Vis Destructicas: where each one can kill a player very fast. This means that players without a spread and high bullet damage will die pretty fast. Twin Turrets, lead a fire on the closest player. They do deal high damage and have high speed, but low penetration. Corroder turret ( one in front ), fires a slower, but more powerful bullet which is harder to penetrate, and can kill a player if collided. The Vis Ultima has a very large hitbox compared to its visible body, as shown by the size of its health bar.

Spawning
Spawns by a randomizer.

Countering
Vis Ultima deals heavily focused fires: only tanks with high penetration like minigunner can neglect it. Vis Destructicas, however, is a larger problem. They come from two flanks, and can easily kill a player. Also, Vis Ultima moves with relatively high speed for a boss. All slow-firing tanks are useless, minions and drones will not be able to out-damage it. Redistributors can eliminate most of the boss's health points but may die shortly after. High damaging tanks, with medium spread and low bullet speed, are ideal at killing this boss. Boss will mostly reside at the nest, so use it to your advantage to start attacking first. If you have the correct tank ( mostly machine gun branch ) you can kill Vis Ultima in solo. Although, note, that the this method may require decent skill, open space, and absence of other players: Vis Ultima will outgun you in closed spaces and requires all of its bullets to be penetrated, so you are defenseless against other players.

Multiple players will eliminate Vis Ultima even faster. One player will distract Vis Destructicas and another one will penetrate auto-turrets fire and deal main damage. Vis Ultima will die before it will be able to kill either player. Although, it is not necessary.

If you are in a maze mode, minion tanks are the best: your minions will ram into the Vis Ultima and deal heavy damage to the boss. All of the projectiles will be tightly packed, but your minions are more durable. Still, even now it is suggested that you strike first. Vis Ultima has low Shield capacity, so less health it has, the more damage you will deal to the Vis Ultima.

Trivia

 * Vis Ultima's death message is unique: A Vis Ultima dictum usurpavit!.
 * Vis Ultima's Vis Destructicas are weaker versions of Vis Destructica.