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Wyvern is a Flying Dutchman Crew Member that spoke of the Dead Man's Chest, part of Pirates of the Caribbean.
He became part of the ship and is part coral part man. He told Will Turner that whoever stabs Davy Jones's heart will become the next captain of the Flying Dutchman, then retreated back to his habitat. He was freed from his coral self when Will Turner stabbed the heart and became the next captain.