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Look to your right and look at the first item you see, now you have to fight Duke Fishron with it.
A Backgammon/Chess board (it can be used for both)
I better hope Duke Fishron is lucky, because I'm pretty damn good at Backgammon. (It won't be much of a challenge if he isn't lucky - I don't really expect the strategic capabilities of a fish to be high, especially not in a game like backgammon))