Sometimes mistaken for the rare, valuable marble oyster, eating this particular sea creature is not good for the longterm health of the consumer.
DMs: Because someone eating one of these wouldn't know right away that eating one of these oysters is a bad thing, you might want to consider secretly rolling the saving throw against the disease for the PC, or having them roll randomly at a later time without telling them what it's for.
This was made for day 10 of Mer-May, a month of daily, underwater-themed homebrews.