Fanon:Stormcaster (GellyPop)

The Stormcaster is an AI-controlled Boss in Diep.io. It uses a large Octo Tank auto turret on its middle, while its corners are being mounted with Predator cannon setups.

Design
The Stormcaster have a large Green Triangle body being the same size with Defender/Guardian. On the middle of the body is a large auto turret with eight cannons positioned like an Octo Tank. Each corner of the boss' body has a Predator cannon setup.

Lore
The Green Triangle that is entitled as "Bringer of Ballistophobia, Stormcaster" has been a major threat to the tanks. As its name suggest, it can cast upon storms that brings destruction and tragedy to those who oppose it, through its massive bullet count that is hard to count. Those who wants to be pacifist have declined the use of cannons after facing the Stormcaster and feared bullets, while the boastful ones end up getting destroyed.

Technical
The Stormcaster acts like a Defender, moving and spinning slowly while attempting to fire nearby tanks. If there isn't too many tanks, it may attempt to spin on a target's direction to aim with its Predator cannons. This boss has an extremely rare chance to replace a Defender spawn.

The Stormcaster possess a high health of 30,000. Its regen is slow until thirty-seconds have passed and the fast regeneration rule kicks up.

The bullets fired from the Octo turret doesn't deal high damage, but continuously receiving the bullet storm can deplete one's health in at least six seconds. The turret fires on the same rate of Octo Tank with maxed out Reload. The bullets fired from the Predator cannons are a bit stronger, although there's no difference despite the size.

If defeated, the Stormcaster will reward 3,000,000 XP to the player who gave the killing blow to it, being triple the amount needed to obtain the "Okay, you're pretty good" achievement, as well as the possible boss achievement. All bullets that are fired before the Stormcaster is destroyed will still move on their direction until they disappear for reasons, so they can still hurt tanks.

Strategy
The Stormcaster's massive hell of bullets is a challenge even for a team of players. While tactics when fighting an Octo Tank may apply, coordination and total teamwork is required to beat this boss. The damage is pretty heavy to be resisted and also hard to be dodged.
 * Strong Against: Multiple tanks without focused fire, Smasher branch, Tri-Angle branch, Quad Tank branch, tanks without focused fire.
 * Weak Against: Twin branch, tanks with focused fire, Auto Trapper, Overlord, Ranger (if far away).

Teams of high-damaging tanks like Triplet and Hybrid and support tanks like Auto Trapper is needed in order to defeat the boss. Building barriers with traps while attempting to get near the Stormcaster is a common strategy. The traps must be replenished pretty fast, while the damaging tanks focus on shooting the Stormcaster.

Trivia

 * This boss was named and entitled such due to its storm of bullets that can actually overpower some of the stronger tanks.

Special Thanks to (Credits)

 * , for giving feedback regarding the boss' power in Discord few months ago.