- Description: Shellfish from Dorio, who was struggling alone but was grateful you heard what he had to say. Its iridescent colors are rather the unforgettable sight.
- Usage: Requirement for Shim Cheong's special quest
- How to Obtain: Received as a quest reward from Dorio in the Sea Palace.
※ This is a quest item.※ Bring Iridescent Shellfish x4 to the Netherworld Maiden, Shim Cheong, to proceed with quests that will grant you a special fish tank.※ The fish tank which bears Netherworld-ly powers absorbs all light of the living world thus allowing for any stored fish to expire much later.※ The Tale of Shim Cheong knowledge is required to receive a special quest from Shim Cheong.※ To hand over Iridescent Shellfish to Shim Cheong during the quest, you have to be Fishing Master 1 and higher.