Blood Boiler

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Blood Boiler
  • Blood Boiler.png
  • Blood Boiler tank
Stack digit 1.png
Damage115 Ranged
Knockback4 (Weak)
Critical chance4%
Use time25 Slow
Velocity47.5 effective
TooltipFires twin streams of life stealing bloodfire that returns to you
Uses your health as ammo
40% chance to save health
Inflicts DebuffBurning BloodBurning Blood
100% chance

Debuff duration10 seconds
Debuff tooltipYour blood is on fire
RarityRarity Level: 12
Sell 30 Gold Coin.png
Research1 required
The Blood Boiler in use.

The Blood Boiler is a craftable post-Moon Lord flamethrower. When used, it fires two long and continuous streams of bloodfire. Each use has a 60% chance to subtract 1 health from the player. The fire curves back and returns to the player and has a 33.33% chance to heal them for 2 health each. If the flame hits an enemy, it has a 50% chance to heal the player for 3-5 health.

Its best modifier is Unreal.



Crafting Station
Ancient ManipulatorAncient Manipulator
Bloodstone CoreBloodstone Core6
Blood BoilerBlood Boiler1



  • If the player is killed by the Blood Boiler's self-damage, the death messages "<PlayerName> suffered from severe anemia." or "<PlayerName> was unable to obtain a blood transfusion." will display.


These history sections are still a work-in-progress, and may not yet contain changes relevant to the current version of the Calamity Mod.
  • Decreased lifesteal when hitting an enemy from 4-6 to 3-5, but it no longer completely disables life regeneration while being used.
    • Now obeys the lifesteal cooldown.
    • Now heals for 2 health instead of 1 normally, and 4-6 health instead of 2-3 after hitting an enemy.
    • Now considered a specialist weapon.
    • Increased sell price from 24 Gold Coin to 30 Gold Coin.
    • Fixed its backpack sprite sometimes drawing with an incorrect offset.
  • Tooltip now mentions that it has a 40% chance to not consume health.
    • Nerfed damage from 145 to 115, use animation from 15 to 25, and shot speed from 12 to 9.5.
    • Now fires 2 flame streams at once. Flames now have 4 extra updates instead of 1, lose 15% damage on each hit, grant -1 local immunity frames instead of 5 ID-static immunity frames, and inflict Burning Blood for 10 seconds instead of 4.
    • Now has a 40% chance to not consume health instead of 25%.
    • Improved its flame visuals.
  • No longer inflicts Brimstone Flames.
  • Now inflicts Brimstone Flames and Burning Blood for 4 seconds instead of 6.
    • Nerfed damage from 400 to 250, but projectile now grants enemies 5 local immunity frames instead of 10.
    • No longer required to be used in 10 second bursts; it now has a use time of 5. Increased projectile size by 50% and its range by 20%. Now has a 25% chance to not consume the player's health as ammo when used.