Calamity Mod Wiki
AI TypeCnidrion AI
Damage20 / 40 / 50 / 56 (Contact)
18 / 48 (Water blasts)
Max Life280 / 560
KB Resist95% / 95.5%
Inflicts debuffWetWet
100% chance
Debuff duration4 seconds (Water blasts)
Debuff tooltipYou are dripping water
Immune toConfusedKami Flu
BannerCnidrion BannerCnidrion Banner
Not to be confused with Cnidarian, a yoyo made with Victide Bars.

Cnidrion is a Pre-Hardmode enemy that can spawn in the Surface Desert biome. It will attempt to follow the player while firing a burst of four water blasts every ten seconds. Its firing rate doubles while below 33% / 60% health, and triples while below 10% health.


  • Cnidrion is one of the few enemies that can be detected by the Lifeform Analyzer.
  • While passing through bodies of water, its projectiles are almost invisible.
  • It can be a dangerous enemy for Pre-Hardmode players exploring the Desert, due to its large hitbox.
  • In Death Mode, they can fire water blasts while moving.


  • Cnidrion can swim through blocks in order to reach the player. Its projectiles, however, cannot pierce blocks; barricading with blocks while it shoots and attacking it while it approaches is a good strategy to take one down, provided the player either has high enough DPS or multiple barriers to fall back to.


  • The name Cnidrion is derived from "Cnidaria", a term used for individuals of the cnidaria phylum, which contains organisms such as anemones, corals, and jellyfish.
    • Despite this, Cnidrion's design takes after seahorses, who are instead members of the extremely distantly related chordate phylum.
  • Cnidrion's theme music was featured at the beginning of the official music video of UNIVERSAL COLLAPSE, theme of the Devourer of Gods' second form as a joke.
  • Cnidrions were originally considered a mini boss, but were demoted due to their maximum health not reaching the threshold required for the Boss Health Bar to appear.