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[purrdue5]

From the Inventory Guide that SpiritWind keeps updated:
Blue shell
Info: A bright blue shell used in various recipes.
Found: Tidegate, Ripley - Blue Marmosea, Tide Dragon, Armored Kelpie
Uses: item in Blue Marmosea craft

Thanks so much, it must be super rare as I tried most of them & haven't gotten a thing but I'll keep trying. Thanks for your help.