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Map icon
EnvironmentAcid Rain
DamageThis attack will cause defense damage on hit. 135 / 270 Expert Mode / 405 Master Mode (Contact)
140 / 220 Expert Mode / 244 Revengeance Mode / 264 Death Mode / 420 Master Mode (Bubble, Droplet)
Max Life90,000 / 144,000 Expert Mode / 216,000 Master Mode
KB Resist100%
Inflicts debuffIrradiatedIrradiated
100% chance

Debuff duration7 seconds (Contact)
2 seconds (Bubble)
1 second (Droplet)
Debuff tooltipYour skin is burning off
Immune toConfusedPoisonedAcid VenomIrradiatedSulphuric Poisoning
Cold Bestiary Cold.png-
Water Bestiary Water.pngResistant
Sickness Bestiary Sickness.pngResistant
Electricity Bestiary Electricity.pngVulnerable
Heat Bestiary Heat.pngResistant

The Mauler is a post-Moon Lord mini boss that spawns during Acid Rain during Tier 3. It is accessible after Polterghast has been defeated. It swims towards the player and alternates between three attacks at random, each telegraphed by a different roar.

  • Quickly lunges at the player.
  • Fires three spreads of Sulphuric Acid BubbleSulphuric Acid Bubbles that home in on the player after a delay.
  • Charging horizontally and firing a large barrage of Acid DropletAcid Droplets upwards, which home in on the player after a delay.

If it is out of the water for too long, it will start repeatedly using its charge attack until it lands back in water again.

It can be detected with the Lifeform Analyzer.


  • Shark Fins dropped by the Mauler will be brown in color Mauler Shark Fin.png, much like the Shark Fins dropped by Sand Sharks.
  • In the Get fixed boi seed, Maulers explode into a circle of 50 sulphuric acid mists and bubbles upon death.


  • The BestiaryBestiary entry for the Mauler: "Powerful radiation has caused prehistoric genes to reawaken in this shark, granting it overwhelming speed and strength. The insatiable hunger of this beast draws it to the shoreline during acidic rainstorms for a feeding frenzy."
  • The Mauler formerly spawned randomly in the Sulphurous Sea regardless of progression or what events were taking place.
    • Additionally, when out of the water for too long, the Mauler exploded instead of trying to charge back into the water. This method of killing the Mauler did not give any loot.
  • If the Boss Checklist Mod is installed, its unique despawn message will be "The brutish shark looks elsewhere to turn its aggression."


These history sections are still a work-in-progress, and may not yet contain changes relevant to the current version of the Calamity Mod.
    • No longer deals 10% Revengeance Mode / 16% Death Mode more damage.
    • Buffed acid bubble and acid drop damage from 140 / 220 Expert Mode to 140 / 220 Expert Mode / 244 Revengeance Mode / 264 Death Mode / 420 Master Mode.
  • Changed health from 85,500 / 177,000 Expert Mode / 265,500 Master Mode to 90,000 / 144,000 Expert Mode / 216,000 Master Mode.
    • Changed Boss Checklist Mod despawn message from "The ravenous shark has mauled everybody's corpses." to "The brutish shark looks elsewhere to turn its aggression."
    • Now properly displays vanilla debuff colors and Hunter Potion effects.
    • Added a map icon.
    • Now drops its Relic at 100% chance instead of 25%.
    • Added it to Boss Checklist.
    • Nerfed health from 165,000 / 330,000 Expert Mode to 88,500 / 177,000 Expert Mode.
    • Reworked AI, now randomly selects a range of three attacks: roaring then charging directly towards the player, swimming horizontally which releases homing acid droplets upwards, and firing three spreads of bubbles.
    • Now vulnerable to electricity debuffs, but resistant to water, sickness, and heat debuffs.
  • Now inflicts Irradiated for 7 seconds but no longer inflicts Bleeding, Feral Bite, or Venom.
  • Nerfed contact damage from 135 / 270 Expert Mode / 337 Revengeance Mode / 388 Death Mode to 135 / 270 Expert Mode / 297 Revengeance Mode / 313 Death Mode.
    • Increased minimum coin drop amount from 5 Gold Coin to 25 Gold Coin.
    • Fixed a sheeting error.
    • Buffed health from 144,000 / 288,000 Expert Mode to 165,000 / 330,000 Expert Mode.
    • Buffed contact damage from 115 / 230 Expert Mode to 135 / 270 Expert Mode.
    • Increased Marked for Death and Horror duration from 2.5 Revengeance Mode seconds to 3 Revengeance Mode.
    • Now has gores.
  • Nerfed damage reduction from 20% to 5%.
    • Buffed health from 120,000 / 240,000 Expert Mode to 144,000 / 288,000 Expert Mode.
    • Nerfed damage reduction from 40% to 20%.
  • Nerfed health from 180,000 / 360,000 Expert Mode to 120,000 / 240,000 Expert Mode.
  • Explosions now move instead of making its hitbox larger.
    • Nerfed spawn rates depending on what stage of the game the player is at.
    • Nerfed contact damage from 225 / 450 Expert Mode to 115 / 230 Expert Mode, and mist damage from 70 / 100 Expert Mode / 150 Death Mode to 50 / 90 Expert Mode / 135 Death Mode.
    • Buffed health from 15,000 / 30,000 Expert Mode to 180,000 / 360,000 Expert Mode.
    • Now has a custom roar.
    • No longer drops the Angler if the Angler hasn't been saved.
    • Lowered spawn rate.