The Merman is an NPC that spawns once Duke Fishron has been defeated in a world and there is a suitable Ocean Biome house for him to move into. He sells end-game ocean-related items and tools.
- Fishscale Greaves (25 )
- Fishscale Chestplate (30 )
- Fishscale Helmet (20 )
- Air Tube (5 )
- Air Tube Anchor (80 )
- Air Pump (1 )
- Air Helmet (5 )
- "I don't like this home. Too dry." (only if not in Ocean Biome home).
- "Ah, can you smell the sea spray?"
- "There's a storm blowing in... I can feel it... oh, it's already here?" (only during rain)
- "They say that Fishron's defeat enrages the ocean."
- "Whew, am I glad to be free of that Duke!"
- "My home waters are red..." (only during Blood Moon)
- "There's an eclipsed sun reflected in the sea..." (only during Solar Eclipse)
- "I love the Merfolk Bunnies of my homeland, cute little vicious creatures."