Calamity Mod Wiki
  • Hydra.png
Stack digit 1.png
Knockback10 (Extremely Strong)
Critical chance0%
Use time33 Slow
TooltipUses Explosive Shotgun Shells
Does more damage to everything
Can be used once per boss battle
RarityRarity Level: 8
Sell 16 Gold Coin.png

The Hydra is a craftable Hardmode classless weapon that deals massive damage to all enemies. When used, it fires fifteen extremely fast pellets that create small explosions when hitting an enemy or a tile. The damage it deals is proportional to the hit enemy's max health, making it incredibly effective against enemies with large amounts of health, such as late-game bosses.

It exclusively uses Explosive Shotgun Shells as ammo, which can be bought from the Arms Dealer if the player has the Hydra in their inventory.

Once a boss is spawned, the Hydra is only fireable once until the boss is defeated or until it despawns after the player is killed.

The Hydra cannot be reforged, and therefore cannot have modifiers.




  • Despite resembling a gun, the weapon has no damage type, making it equally effective for all classes.
  • This weapon does not have any critical strike chance and cannot gain any from Accessories, Modifiers, Buffs and Armor bonuses.
  • Each of the Hydra's bullets deal approximately 1.632% of the hit enemy's max health as damage. If all fifteen of the bullets hit, they can deal up to 24.48% of a target's max health prior to defense and damage reduction calculations.