- 内部 NPC ID：220
The 海蜗牛 is a rare 敌怪 that spawns in the 海洋 on either end of the world, usually during the daytime. Even then the spawn rate is still the lowest of all enemies in the Ocean, one third that of 乌贼s. It slowly crawls along the sea floor. When killed it drops 紫粘液, which is used to create 紫染料 at a 染缸. They are immune to the 困惑 减益.
- The Murex sea snail was used to create purple dye in the real world.
- It closely resembles the Syrinx aruanus (or false trumpet snail), the largest gastropod still existing.
- Altrough this enemy is very rare, it cannot be detected by the Lifeform Analyzer.
- 220.127.116.11：Can now drop its own respective banner.