Neptune's Shell

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Neptune's Shell
  • Neptune's Shell item spriteold Neptune's Shell item sprite
Stack digit 1.png
TooltipTransforms the holder into merfolk when entering water
RarityRarity level: 5
Sell7 GC50 SC
Research1 required
Grants Buff
Buff tooltipCan breathe and move easily underwater
DurationWhile underwater
Merfolk example.png Merfolk Female.png
Merfolk form.
Obtained from Obtained from
Classic mode icon.png Classic
Expert mode icon.png Expert
Master mode icon.png Master
Creature from the DeepCreature from the Deep.pngCreature from the Deep12%3.96%

Neptune's Shell is a Hardmode accessory that aids performance underwater (and in other liquids) by granting indefinite breathing time underwater, swimming via the Jump key, and eliminating the slow movement speed usually caused by water. Entering water with this accessory equipped transforms the player into Merfolk form. While in this form, the breath meter will not display (nor will it decrease), therefore effectively preventing drowning.

Neptune's Shell can be considered an upgrade from the Diving Gear in most respects, but lacks the extra mobility on ice of the Arctic Diving Gear and the extra lighting underwater of the Jellyfish Necklace.



ResultIngredientsCrafting station
Old-gen console versionNintendo 3DS version only:
Neptune's ShellNeptune's Shell
Mythril AnvilMythril Anvil
Orichalcum AnvilOrichalcum Anvil

Used in

ResultIngredientsCrafting station
Moon ShellMoon ShellTinkerer's WorkshopTinkerer's Workshop


  • Swimming speed nears that of flying through air with wings.
  • Swimming in honey activates all the perks of Merfolk but does not allow the player to move at full speed.
  • Neptune's Shell does not function in lava.
  • Landing in and "jumping" from water alone (by swimming up past the surface), without touching land, does not reset flight time for wings or variants of Rocket Boots.
  • The Merfolk form is affected by dyes.
  • The Merfolk effect takes priority over the benefits of Moon Charm and its upgrades, causing the player to lose Werewolf's bonuses while in water.
  • Neptune's Shell can also be equipped as a vanity accessory, which causes the Merfolk form to appear regardless of whether the player is in water. This is merely the appearance of the Merfolk, the buff will not take effect while it is equipped as a vanity (caution should be taken when in water, as the player will need to watch their breath meter).
  • (Desktop, Console and Mobile versions) Wearing a Fish Bowl will activate the Merfolk buff.


  • (Old-gen console and 3DS versions) Half of the ingredients can be obtained pre-Hardmode, so it pays to collect them as early as possible.
  • An easier/faster way to get the Neptune's Shell is by placing a Water Candle and/or consuming the Battle Potion because the Solar Eclipse does not have a set spawn rate.