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3,000 HP


The Defender is one of the polygon bosses in diep.io. It is a combination of a Tri-Trapper and an Auto 3: it has 3 trappers and 3 auto-turrets. It is, like any boss, very powerful: do not underestimate the Defender. Despite having a reddish body, it shoots yellow traps and bullets. No ramming tank can defeat it, since it has a lot more health than an average tank.


Because of the defensive nature of this tank, the most obvious strategy would be to max out bullet penetration and stay out of range of the traps. Auto turrets' AI are notoriously inaccurate, so they should not prove much of a threat. However, it should be said that if you don't pay attention to the bullets, you may die.

Tanks to use

  • Sniper and upgrades (not the Trapper and upgrades, rather the Overseer branch).
  • Bullet spammers with very high bullet penetration and reload.

Tanks not to use

Playable Tier 1 Tank
Tier 2 Flank Guard  •  Machine Gun  •  Sniper  •  Twin
Tier 3 Assassin  •  Auto 3  •  Destroyer  •  Gunner  •  Hunter  •  Overseer  •  Quad Tank  •  Smasher  •  Trapper  •  Tri-Angle  •  Triple Shot  •  Twin Flank
Tier 4 Annihilator  •  Auto 5  •  Auto Gunner  •  Auto Smasher  •  Auto Trapper  •  Battleship  •  Booster  •  Factory  •  Fighter  •  Gunner Trapper  •  Hybrid  •  Landmine  •  Manager  •  Mega Trapper  •  Necromancer  •  Octo Tank  •  Overlord  •  Overtrapper  •  Penta Shot  •  Predator  •  Ranger  •  Rocketeer  •  Skimmer  •  Spike  •  Sprayer  •  Spread Shot  •  Stalker  •  Streamliner  •  Tri-Trapper  •  Triple Twin  •  Triplet
Special Dominator  •  Mothership
Mobs Bosses Defender  •  Fallen Overlord  •  Fallen Booster  •  Guardian  •  Summoner
Other Arena Closer  •  Dominator
Polygons Squares Minion
Triangles Base Drone  •  Crasher  •  Drone
Pentagons Alpha Pentagon
Other Discontinued Auto Tank  •  Machine Gun (v2)  •  Mega Smasher  •  Predator (old)  •  Sprayer (old)  •  X Hunter