Cannonball Jellyfish

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Cannonball Jellyfish
Cannonball Jellyfish.png
Damage50 / 100 Expert Mode / 150 Master Mode (Contact)
150 / 300 Expert Mode / 450 Master Mode (Explosion)
Max Life400 / 800 Expert Mode / 1200 Master Mode
KB Resist100%
Inflicts debuffPoisonedPoisoned
100% chance

Debuff duration2 seconds (Contact)
4 seconds (Explosion)
Debuff tooltipSlowly losing life
Inflicts debuffRiptide (debuff)Riptide
100% chance

Debuff duration2 seconds (Contact)
4 seconds (Explosion)
Debuff tooltipLashed at by powerful waters
Immune toConfusedCrush DepthRiptide (debuff)
BannerCannonball Jellyfish BannerCannonball Jellyfish Banner

The Cannonball Jellyfish is a Pre-Hardmode enemy that spawns in the first layer of the Abyss. It bobs up and down while underwater and emits a medium amount of turquoise light. When killed, it instead emits red light and halts for one second, then launches towards the player, exploding upon impact.


  • The BestiaryBestiary entry for the Cannonball Jellyfish: "These jellyfishes help keep the Abyss clean from the sulphuric poisoning. Unlike most hard-skinned creatures in the Sulphurous Sea, they instead use their stingers to drain the acid near them to later use it for self-defense."
  • Cannonball jellyfish are a real species of jellyfish that get their name due to their similarities to cannonballs in shape and size.
  • The Cannonball Jellyfish's behavior is inspired by Oomas from the game Hollow Knight.

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.
    • Decreased Poisoned duration on contact from 5 seconds to 2, and from explosion from 10 seconds to 4. It now inflicts Riptide for 2 seconds on contact, and 4 seconds from explosion.