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EnvironmentSulphurous SeaAbyss
Damage10 / 20 Expert Mode / 30 Master Mode (Contact)
70 / 100 Expert Mode / 150 Master Mode (Sulphuric mist)
Max Life40 / 80 Expert Mode / 120 Master Mode
KB Resist65% / 68.5% Expert Mode / 72% Master Mode
Inflicts debuffIrradiatedIrradiated
100% chance

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

The Sulflounder is a Pre-Hardmode enemy that spawns in the Sulphurous Sea and in the first layer of the Abyss. It initially stays invisible on the sand, waiting for the player to come near or hit it, in which it will then become visible and hostile. It attacks by slowly swimming towards the player while spraying sulphuric mist projectiles at them.


  • The BestiaryBestiary entry for the Sulflounder: "A relative to certain hadopelagic creatures living in the depths, the Sulflounders are a branch in their evolution with a fragile exterior. This allowed them not to sink to the bottom of the Abyss, though their flesh is barely enough to withstand the acidic water."
  • In real life, flounders are a group of flatfish species. They are found at the bottom of oceans around the world; some species will also enter estuaries.


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.
    • Nerfed acid mist damage in Master Mode from 75 Master Mode to 63 Master Mode.
    • No longer deals contact damage.
  • Fixed it having an incorrect bestiary offset.
    • Renamed from "Flounder" to "Sulflounder".
    • Now has gores.
  • Now vulnerable to electricity debuffs, but resistant to water, sickness, and heat debuffs.
  • Now inflicts Irradiated for 2 seconds but no longer inflicts Venom.
  • Decreased minimum coin drop amount from 5 Silver Coin to 80 Copper Coin.
  • Decreased Venom duration from 3 seconds to 2.
  • No longer has 20% damage reduction.
  • Nerfed health from 60 / 120 Expert Mode to 40 / 80 Expert Mode.
    • Nerfed health from 110 / 220 Expert Mode to 60 / 120 Expert Mode, and mist projectile's damage from 35 / 44 Expert Mode / 66 Death Mode to 25 / 38 Expert Mode / 57 Death Mode.
    • Resprited.