Aquatic Urchin

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Aquatic Urchin
Aquatic Urchin.png
EnvironmentSulphurous SeaAbyss
Damage25 / 50 Expert Mode / 75 Master Mode (Pre-Hardmode)
50 / 100 Expert Mode / 150 Master Mode (Hardmode)
Max Life50 / 100 Expert Mode / 150 Master Mode (Pre-Hardmode)
300 / 600 Expert Mode / 900 Master Mode (Hardmode)
KB Resist20% / 28% Expert Mode / 36% Master Mode
Inflicts debuffIrradiatedIrradiated
100% chance

Debuff duration2 seconds
Debuff tooltipYour skin is burning off
Immune toConfusedPoisonedAcid VenomIrradiatedSulphuric Poisoning
BannerAquatic Urchin BannerAquatic Urchin Banner
Cold Bestiary Cold.png-
Water Bestiary Water.pngResistant
Sickness Bestiary Sickness.pngResistant
Electricity Bestiary Electricity.pngVulnerable
Heat Bestiary Heat.pngResistant

The Aquatic Urchin is a Pre-Hardmode enemy that spawns in the Sulphurous Sea and in the first layer of the Abyss. It sticks to tiles within the sea and drifts around, similar to Blazing Wheels.


  • The BestiaryBestiary entry for the Aquatic Urchin: "Closely related to sea urchins, aquatic urchins have been forced to adapt to the acidic water and radioactive waste. Their venomous spikes would normally deter predators, but in the environment it lives in, a painful meal is still a meal. Nothing in this sea can afford to be a picky eater."

See also


These history sections are still a work-in-progress, and may not yet contain changes relevant to the current version of the Calamity Mod.
  • Now has 25% less health and 10% less damage in Master Mode.
  • Fixed a grammatical error in its bestiary entry.
  • Fixed it having an incorrect bestiary offset.
  • Now drops 30-50 Urchin Stingers instead of 15-25.
  • Now vulnerable to electricity debuffs, but resistant to water, sickness, and heat debuffs.
  • Now inflicts Irradiated for 2 seconds instead of Venom.
  • No longer has increased health during Boss Rush.
  • Buffed health in Hardmode from 50 / 100 Expert Mode to 300 / 600 Expert Mode, and damage from 25 / 50 Expert Mode to 50 / 100 Expert Mode.
  • Decreased minimum coin drop amount from 5 Silver Coin to 80 Copper Coin.
  • Decreased Venom duration from 3 seconds to 2.
  • Nerfed health from 80 / 160 Expert Mode to 50 / 100 Expert Mode.