Calamity Mod Wiki
EnvironmentSunken Sea
AI TypePrism-Back AI
Damage20 / 40 / 50 / 56 (in Pre-Hardmode)
40 / 80 / 100 / 112 (in Hardmode and when above one in Pre-Hardmode)
80 / 160 / 200 / 224 (when above one in Hardmode)
Max Life350 / 700 (in Pre-Hardmode)
1000 / 2000 (in Hardmode)
Defense10 (in Pre-Hardmode)
25 (in Hardmode)
KB Resist85% / 86.5%
Immune toConfusedKami FluEutrophication
BannerPrism-Back BannerPrism-Back Banner

The Prism-Back is a Pre-Hardmode enemy that spawns in the Sunken Sea biome. They are always passive, even if the player attacks them, and only swim back and forth. However, despite being passive, they are able to deal contact damage, and deal even more contact damage if they player touches the top of their spiked shells.

Prism-Backs receive a boost to their stats when the world enters Hardmode.


  • Players should avoid getting in the path of Prism-Backs, as they deal high contact damage at the point in the game they are encountered and will not try to run away from the player.
  • If a Prism-Back ends up out of water, it will be unable to move.