Sea Snail

Type	Aquatic
Environment	Ocean
AI Type	Fighter AI
Damage	20/40›72/60›108
Max Life	40/80›176/120›264
Defense	10/10›20
KB Resist	0%/10%/20%
Banner	Sea Snail Banner(Desktop, Console and Mobile versions)
Immune to
Coins	60 CCPre-Hardmode: 1 SC50 CCHardmode: 2 SC40 CC
Hurt	https://terraria.wiki.gg/wiki/File:NPC_Hit_1.wav
Killed	https://terraria.wiki.gg/wiki/File:NPC_Killed_1.wav

The Sea Snail is a rare pre-Hardmode enemy that spawns in the Ocean. The Sea Snail's spawn rate is the lowest of all enemies in the Ocean, one-third that of Squids. It slowly crawls along the seafloor while attempting to deal contact damage. When killed, it drops Purple Mucus, which is used solely to craft Purple Dye at a Dye Vat.

It is one of the few entities that can be detected by the Lifeform Analyzer(Desktop, Console and Mobile versions) or its upgrades.

Tips

The easiest way to farm Sea Snails would be to summon a Blood Moon or a Solar Eclipse, and to camp out at the bottom of the Ocean with a Water Candle and a Battle Potion as well as using equipment that lets the player breathe underwater (such as a Neptune's Shell) and killing any enemies that spawn. If done correctly, the player should obtain the Sea Snail's respective banner in roughly two in-game days.

Trivia

It closely resembles the Syrinx aruanus (commonly known as Australian trumpet or false trumpet), the largest extant snail (shelled gastropod) species in the world, and the largest (heaviest) gastropod in the world.
The Murex sea snail was used to create purple dye, a dye that was so rare that its value was its own weight in gold. This is also why most country flags do not contain purple.

The Bestiary entry for the Sea Snail: "This unusually large snail makes its home deep in the ocean. Its mucus can be manufactured into a purple dye."