Flak Toxicannon

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Flak Toxicannon
  • Flak Toxicannon.png
Stack digit 1.png
TypeWeaponCrafting material
Damage73 Ranged
Knockback0 (No Knockback)
Critical chance4%
Use time44 Extremely Slow
TooltipFires a toxic shell that explodes into a cone of radioactive sludge
Toxic shells burst when they reach the cursor's position
Direct hits with the toxic shell will reduce the damage dealt by the sludge
Uses rockets for ammo
Inflicts DebuffIrradiatedIrradiated
100% chance

Debuff duration3 seconds
Debuff tooltipYour skin is burning off
RarityRarity Level: 5
Sell 4 Gold Coin.png 80 Silver Coin.png
Research1 required
Projectiles created
Flak Shot
Flak Shot
Acid Droplet
Acid Droplet
Dropped by
Flak Crab15%
Hydrothermal Crate110% (Post-T2 Acid Rain Icon.png)

The Flak Toxicannon is a Hardmode launcher that is dropped by Flak Crabs. When used, it fires a toxic flak shell that bursts into 4 acid sludge projectiles when it hits an enemy, or when it reaches the cursor. If the flak shell directly hits the enemy, it will reduce the damage of the sludge from 60% damage to 20%. The flak shots and acid sludge projectiles do not pierce. Once the weapon is used, it will slightly push the player back in the direction of where the weapon fires.

Its best modifier is Unreal. However, the weapon's knockback will not be affected due to already being 0.


Used in



These history sections are still a work-in-progress, and may not yet contain changes relevant to the current version of the Calamity Mod.
    • Reworked:
      • Buffed damage from 51 to 73, but nerfed use time from 11 to 44, knockback from 7 to 1.1, and shot speed from 16 to 15.
      • No longer rapidly fires flak shots while aiming above the player that burst into toxic droplets.
      • Now fires toxic flak shells that burst into 4 sludge projectiles when hitting enemies or when the projectile reaches the cursor. Sludge created when the flak shell directly hits an enemy will deal less damage than if it splits before.
    • Nerfed damage from 60 to 51 and use time from 8 to 11, but it can now be shot in a slightly wider angle.
    • Shots now always spawn 1-2 droplets instead of having a 33% chance to spawn 1-3, and droplets now last 5 seconds instead of 7.
  • Decreased sell price from 7 Gold Coin.png 20 Silver Coin.png to 4 Gold Coin.png 80 Silver Coin.png.
  • Acidic droplets now grant 17 local immunity frames.
  • Buffed damage from 50 to 60 and velocity from 9 to 16.
  • Blast now inflicts Irradiated for 4 seconds instead of 5.
    • Nerfed damage from 31 to 25.
    • Fixed rain droplets dealing rogue damage instead of ranged damage.
  • Fixed it applying Irradiated to players instead of enemies.