Box Jellyfish

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Box Jellyfish
Box Jellyfish.png
Damage44 / 88 Expert Mode / 132 Master Mode
Max Life90 / 180 Expert Mode / 270 Master Mode
KB Resist0% / 10% Expert Mode / 20% Master Mode
Inflicts debuffAcid VenomAcid Venom
100% chance

Debuff duration2 seconds
Debuff tooltipLosing life
Immune toRiptide (debuff)Crush DepthConfused
BannerBox Jellyfish BannerBox Jellyfish Banner
Cold Bestiary Cold.png-
Water Bestiary Water.pngResistant
Sickness Bestiary Sickness.pngVulnerable
Electricity Bestiary Electricity.pngVulnerable
Heat Bestiary Heat.pngResistant

The Box Jellyfish is a Pre-Hardmode enemy that spawns in the Ocean and the 1st layer of the Abyss. It will remain passive until the player gets too close, it will then attempt to attack the player by swimming towards them.


  • The BestiaryBestiary entry for the Box Jellyfish: "Larger than the average jellyfish, the sting of these persistent pests packs a powerful punch. Though they can be found in most large bodies of water, they are locally extinct around Ilmeris after the Brimstone Witch turned her hexes against the kingdom."
  • The Box Jellyfish acts similarly to its real-life counterpart; they both remain passive until they detect something nearby that may be edible.


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 it having an incorrect bestiary offset.
  • Now vulnerable to electricity and sickness debuffs, but resistant to water and heat debuffs.
  • Buffed health from 45 / 90 Expert Mode to 90 / 180 Expert Mode and damage from 22 / 44 Expert Mode to 44 / 88 Expert Mode.
    • Moves 50% faster in Death Mode.
    • Resprited.
  • Decreased minimum coin drop amount from 5 Silver Coin to 80 Copper Coin.
  • Decreased Venom duration from 3 seconds to 2.
  • Nerfed health from 85 / 170 Expert Mode to 45 / 90 Expert Mode.
  • Nerfed health from 150 / 300 Expert Mode to 85 / 170 Expert Mode, and damage from 40 / 80 Expert Mode to 22 / 44 Expert Mode.