The Underworld

The Underworld (also known as hell or the nether), is the deepest biome in the game, reachable by digging past the stone layer. The Underworld can easily be differentiated from other biomes due to the background wall changing to a lava vein pattern. The Underworld contains partially destroyed buildings called Underworld Houses, which contain Chests, Shadow Chests, Pots and Hellforges. The Underworld is the only biome where you will find Hellstone, Ash, Hellforge and Fireblossom. Healing potions found in Pots will only be Healing Potions rather than Lesser Healing Potions. Additionally, it contains stronger enemies.

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Monsters
 * Bone Serpent
 * Demon
 * Fire Imp
 * Hellbat
 * Lava Slime
 * Voodoo Demon
 * Wall of Flesh (Summon-able Boss)
 * Skeletons (Armored Skeleton, etc.)