Biome
Underground
Underground is a Terraria biome. 14 NPCs spawn here: 
Clothier, 
Demolitionist, 
Digger and 11 more.
What spawns here
Any time 14
Town NPC happiness
Town NPCs judge the biome the player stands in when shopping. For them this page counts as the Underground.
- Likes: Clothier, Demolitionist,
Goblin Tinkerer - Dislikes:
Golfer, 
Mechanic, 
Party Girl, 
Pirate