Perforator Cyst

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Perforator Cyst
Perforator Cyst.png
TypeBoss Summoning
EnvironmentThe Crimson
Max Life1,000
KB Resist0%
Immune toConfused
Cold Bestiary Cold.pngVulnerable
Water Bestiary Water.png-
Sickness Bestiary Sickness.pngVulnerable
Electricity Bestiary Electricity.png-
Heat Bestiary Heat.pngVulnerable

The Perforator Cyst is a rare Pre-Hardmode stationary enemy that spawns in The Crimson biome. When killed, it will summon The Perforators. The Perforator Cyst has abnormally high life for Pre-Hardmode, ensuring that early players won't accidentally summon the boss.

The Perforator Cyst can be prevented from spawning by using the Anti-Cyst Ointment.

The Perforator Cyst can be detected by the Lifeform Analyzer and its upgrades.


  • The Perforators will spawn directly where the Perforator Cyst was after killing it, which means that unprepared players might be taken by surprise.
  • Despite being classified as an enemy, minions will not attack the cyst, exactly like with the Hive Tumor. This is to prevent players who use summon weapons from accidentally spawning The Perforators.
  • Perforator Cysts spawn three times as often after defeating the Eater of Worlds or Brain of Cthulhu if The Perforators have not been defeated yet.
    • Additionally, spawn rates are reduced by 90% in Hardmode.


  • The BestiaryBestiary entry for the Perforator Cyst: "This twitching and convulsing pile of gore acts as the heart of the Perforator Hive, harvesting what small amount of diluted Ichor flowing through the Crimson is left and feeding it to the Hive. Little else is known about it, for those who dare to disturb it have become indistinguishable from the landscape."

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 properly displays vanilla debuff colors and Hunter Potion effects.
    • Can no longer be damaged by Fallen Stars.
    • Fixed an issue where it would not spawn during a Blood Moon.
    • No longer spawns while events are active.
    • Now vulnerable to cold, sickness, and heat debuffs.
    • No longer spawns while the Celestial Pillars event is active.
    • Can now spawn on Crimsand and Crimstone.
  • Now spawns more frequently after either vanilla evil boss has been defeated, but before either Calamity evil boss has been defeated.
  • Can no longer spawn if The Perforator Hive is active.
    • Nerfed health from 2000 to 1000.
    • Can now spawn at any point of the game instead of only after defeating Eater of Worlds or Brain of Cthulhu.
  • Now spawns 4x less often in Hardmode.
  • Now uses vanilla enemy spawn chance instead of custom one.
    • No longer spawns if the player is near a Celestial Pillar.
    • Can now be detected by the Lifeform Analyzer.
    • No longer takes up any NPC slots.