Terraria pylon. You can unlock pylons in Terraria by increasing the happiness of at least two of your NPCs. ... Cavern Pylon: Demolitionist and Guide: Ocean Pylon: Angler and Golfer: ...

Can be rescued from Cavern Layer in Hardmode: Hallow: Golfer and Merchant: Sells magic items: Zoologist: Must have 10-15% of Bestiary completed: Forest: ... Terraria - How to unlock Pylons.