Fallen Overlord

Fallen Overlord is a boss that was added with the release of the game.

Design
Fallen Overlord has a gray circular base with four Overlord drone launchers.

Technical
Fallen Overlord moves with a low speed, and has medium speed. It has many strong drones, which respawn at a pretty fast rate. Drones have high damage, penetration, low health and relatively mediocre speed.

Spawning
Spawns by a randomizer.

Countering
Fallen Overlord has medium health, and can be killed fast enough. The problem is its drones, which have strong penetration, health, and damage. Without drones, Fallen Overlord is defenseless. Drones do have a weakness - they move with medium speed, and fast tanks can easily kill the Fallen Overlord.

Rotor branch and Eagle branch can easily kill Fallen Overlord, with the correct build. All you should do is firstly lure drones away from Fallen Overlord, and then start circling around the boss. This way, you can get rid of drones, while killing the boss itself. If you are a high DPS tank, you will need some movement speed, and high penetration, as you will not have much time to kill Fallen Overlord. Firstly, you should distract the drones as far as possible, and then charge the Fallen Overlord. You have to kill it fast before drones will come back, but it has medium health.

Multiple players can kill Fallen Overlord very easily. One player will have to distract the drones, as all the drones will lock on only a single player. Then, another player can easily finish off Fallen Overlord, as it will be defenseless.

Trivia

 * This is one of 5 original Diep.io bosses: the others are its brethren the Fallen Booster, and the Guardian, Summoner, and Defender.
 * Apparently the Tank A project created these monstrosities.