Heater of Worlds

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

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Spawn

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 last 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.

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. 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.