KO Cannon

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KO Cannon
  • KO Cannon item spriteold KO Cannon item sprite
Stack digit 1.png
Damage40 / 35 (Melee)
Knockback6.5 (Strong)
Critical chance4%
Use time28 (Average)
TooltipShoots a boxing glove
RarityRarity level: 4
Research1 required
Projectile created
  • Boxing Glove
    Boxing Glove
The KO Cannon attacking Target Dummies. Note how it is possible to hit multiple enemies at once.

The KO Cannon is a Hardmode melee weapon which has a 0.1*1/1000 (0.1%) chance to be dropped by enemies which can drop at least 1 during a Hardmode Blood Moon[1]. It autofires a boxing glove projectile that is connected to the weapon's base by a short, thick chain. After striking a target or traveling 17 blocks, the glove retracts back into the weapon before being ready to fire again.

Despite this weapon having a relatively short range, its higher knockback, base damage, and immunity to gravitational arcing makes it very strong at close quarters.

The KO Cannon has no cooldown period; therefore its autofire rate is dependent only on the distance to its impact, meaning that an enemy or object in close range will cause a faster autofire rate.

Its best modifier is Godly or Demonic. Both modifiers increase the average damage output by the same amount.


  • Although technically a flail, the KO Cannon's projectile has no difficulty passing through terrain on its return trip.


  • Although not able to strike multiple targets simultaneously, its rate of fire increases significantly when at closer ranges. Therefore, the player will find fending off hordes of enemies easier once they begin to close in due to its high knockback.
  • One of the easiest ways to obtain this item is to set up multiple Bunny Statues or Fish Statues connected to a 1 Second Timer. During the Blood Moon event, activate the timer and kill all spawned Bunnies. It is easiest to do this with a penetrating weapon, such as a Laser Rifle or any gun using Meteor Shot rounds. Another easy method is to use the Spiky Balls from the Goblin Tinkerer.


  • The Golem Fist can be considered a direct upgrade to this weapon.
  • If aimed to the left, the "KO" on its side will be mirrored.
  • "KO" is an abbreviation of "knockout", a term originally used in boxing, which is also referenced by the boxing glove being fired.


  • Desktop
    • Damage increased from 35 to 40.
    • Fixed a bug where the KO Cannon could drop from statue-spawned enemies.


  1. Information taken from the Desktop version Desktop source code, class KOCannon in Terraria.GameContent.ItemDropRules.Conditions.cs.