Nuclear Terror

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Nuclear Terror
Nuclear Terror.png
Nuclear Terror
Map icon
EnvironmentAcid Rain
DamageThis attack will cause defense damage on hit. 170 / 272 Expert Mode / 408 Master Mode (Contact)
96 / 192 Expert Mode / 288 Master Mode (Bullet, Mist)
Max Life90000 / 144000 Expert Mode / 216000 Master Mode
KB Resist100%
Inflicts debuffIrradiatedIrradiated
100% chance

Debuff duration5 seconds (Contact, Large Bullet)
3 seconds (Medium Bullet)
2 seconds (Acid Mist)
Debuff tooltipYour skin is burning off
Immune toConfusedPoisonedAcid VenomIrradiatedSulphuric Poisoning
Cold Bestiary Cold.png-
Water Bestiary Water.pngResistant
Sickness Bestiary Sickness.pngResistant
Electricity Bestiary Electricity.pngVulnerable
Heat Bestiary Heat.pngResistant

The Nuclear Terror is a post-Moon Lord mini boss that spawns during Tier 3 of the Acid Rain event. It is accessible after Polterghast has been defeated. It has 3 special attacks and 2 other attacks which it uses when not using the special attacks. The three special attacks are as follows:

  • Fires 3-shot bursts of Nuclear BulletNuclear Bullets at the player, which will return to their firing position shortly after being fired.
  • Fires a barrage of Large Nuclear BulletLarge Nuclear Bullets at the player.
  • Fires two converging streams of Large Nuclear Bullets to trap the player.

After it has used a special attack, it will stay in place for 1.25 seconds (0.5 seconds shorter when under 50% life), and then it will lunge at the player multiple times, returning to using a special attack afterwards. It can also teleport to the player, which is telegraphed by green dust.

If the player is below it, it will teleport to the same layer as the player, even if it is in the middle of attacking.

Upon death, the Nuclear Terror will explode into 16 Large Nuclear Bullets or Sulphuric Acid MistSulphuric Acid Mists in all directions.


  • The BestiaryBestiary entry for the Nuclear Terror: "The effects of our actions are never immediately obvious. Centuries of poison and constant fighting for its own life created such monstrosity, now dragged to the shore by the unrelenting torrents. Whatever it may have been before, all that is left now is its will to survive."
  • The Nuclear Terror's design was inspired by the Horror character from the game Nuclear Throne.
  • If the Boss Checklist Mod is installed, its unique despawn message will be "The radioactive aberration fades away in a sickly light."


These history sections are still a work-in-progress, and may not yet contain changes relevant to the current version of the Calamity Mod.
  • Nerfed projectile damage from 48 / 96 Expert Mode / 144 Master Mode to 48 / 76 Expert Mode / 96 Master Mode.
  • Now forces net syncs, even if the net spam counter is too high.
  • Changed Boss Checklist Mod despawn message from "The radioactive monstrosity has further enforced its name." to "The radioactive aberration fades away in a sickly light."
    • Added a map icon.
    • Added new sounds.
    • Now drops its Relic at 100% chance instead of 25%.
    • Added it to Boss Checklist.
    • Nerfed health from 198,230 to 90,000 / 144,000 Expert Mode.
    • Now vulnerable to electricity debuffs, but resistant to water, sickness, and heat debuffs.
    • Nerfed health from 360,420 to 198,230 and damage reduction from 40% to 30%.
    • Now inflicts Irradiated for 5 seconds instead of Sulphuric Poisoning.
  • Fixed a mod conflict that prevented them from being killed.
  • Fixed large Nuclear Bullets not inflicting Sulphuric Poisoning.