Calamity Mod Wiki
Calamity Mod Wiki
Gamma Heart
  • Gamma Heart.png
Stack digit 1.png
Damage120 Summon
Knockback3 (Very Weak)
Use time15 Very Fast
TooltipSummons radioactive heads that are bound by your body
If the entity already exists, using this item again will cause it to gain more heads
Grants BuffGamma Hydra (buff)Gamma Hydra
Buff tooltip...
Inflicts DebuffSulphuric PoisoningSulphuric Poisoning
100% chance

Debuff duration4 seconds (Gamma Bullet)
Debuff tooltipThe acidic water burns away your flesh
Inflicts DebuffElectrifiedElectrified
100% chance

Debuff duration5 seconds (Gamma Deathray)
Debuff tooltipYou cannot move
RarityRarity Level: 13
Sell 28 Gold Coin.png
Projectiles created
Gamma Canister
Gamma Canister
Gamma Shot
Gamma Bullet
Gamma Beam
Gamma Deathray
Dropped by
Nuclear Terror133.33%
Summons Minion
Gamma Hydra
Gamma Hydra.png

The Gamma Heart is a post-Moon Lord summon weapon that drops from Nuclear Terrors. It summons a Gamma Hydra that is attached to the player, with each resummon consuming one additional minion slot for an extra head. The heads fire Gamma Bullets at nearby enemies which inflicts the Sulphuric Poisoning debuff. If the player possesses seven or more heads, a Gamma Canister has a chance to appear. If a head comes into contact with a Gamma Canister, all existing Gamma Heads fire a Gamma Deathray in the cursor's direction that deals 120% of the weapon's damage and inflicts Electrified on enemy hits.

Its best modifier is Ruthless. The Mythical modifier provides the widest array of stat bonuses, but these primarily affect the initial summon rather than the resulting minion. Additionally, minions cannot deal critical hits. The only lasting advantage a Mythical Gamma Heart has over a Ruthless one is knockback.


  • Like the Nuclear Terror, The Gamma Hydra's design was inspired, albeit more directly, by the Horror character from the game Nuclear Throne.
    • In the game, Horror can shoot out a green beam using radiation collected from canisters, in a similar fashion to how the Gamma Heart works.

The Gamma Heart's Gamma Hydras. Notice how the Hydras are unable to fire through blocks and when one comes into contact with a Gamma Canister, a Gamma Deathray is fired that follows the cursor.