Tremor Mod Wiki
Heater of Worlds
Heater of Worlds.png
AI TypeHeater of Worlds AI
Max Life6500 / 8125
KB Resist100%
Inflicts debuffOn Fire!On Fire!
Debuff duration3 seconds
Debuff tooltipSlowly losing life
Immune toOn Fire!Burning
Map Icon Heater of Worlds.png
Map icon

Not to be confused with the Eater of Worlds, a vanilla boss with a similar name.

Heater of Worlds is a Pre-Hardmode boss fought in the Underworld.


The Heater of Worlds doesn't spawn on its own. The only way to summon it is to use a Molten Heart. It can be used anywhere in the Underworld.


Burrows through blocks like standard worm enemies, faster than sprinting speed. Only its head segment can be damaged.


  • Each body segment occasionally releases a spark of flame that has a slight bounce and remains on the ground for a few seconds. Each fireball does half contact damage.
  • Can summon Magma Leeches minions that burrow through blocks like Heater of Worlds itself.

Expert mode[]

  • Contact with Heater of Worlds and Magma Leeches inflicts On Fire! debuff for 3 seconds.


Image Name Condition
Magma LeechMagma Leech When damaged


  • Its drops will be encased in a small Obsidian Brick cube at where the head was, similar to the Wall of Flesh.


  • This boss can easily be rendered ineffectual by creating a thin land bridge between two large masses of Ash Blocks. Have it burrow through one mass to gain enough speed to reach your height, then simply dodge it and take your shots at the tail. Staying out on the bridge will leave you out of its reach, unless it burrows at a perfect angle to travel through the bridge. This is your best chance to do the most damage, just remember that it WILL catch up.


Characters: Zootaloo.png Pre-Hardmode Enemies • Giant Crab.png Hardmode Enemies • Avenger.png Tremode Enemies • Mighty Nimbus.png Event Enemies • Cog Lord.png Bosses • Chef.png Friendly NPCs