The Underworld

Deep under the Cavern Layer, The Underworld begins. You'll know you're near it when Fire Imps and Bone Serpents begin to spawn. It is made of ash blocks, lava, and Hellstone ore. There are also Hellstone Brick buildings scattered across the landscape, which sometimes contain Hellforges.

The Underworld is the most challenging environment so far, giving you access to Hellstone, which can be smelted in a Hellforge to create the strongest armor, weapons and tools.

Monsters in The Underworld

 * Fire Imp
 * Bone Serpent