So the expansion as of now includes pirates with some ugly creatures (bloodhammer,blabla).
So how about an underwater adventure (riding a ship with bubbles,lol) where there are mutated creatures like combined human and shark
And the final boss would be the kraken, since the previous expansion is kraken isles (where no kraken was found).
And a weapon like this.i know there is already kraken trident but this would be longer and more awesome :-)

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