Well I'll be brief, in the game we only have one raid, well, you could put a new raid, a ghost pirate ship (like The Flying Dutchman).
The ship be in motion, the enemies would be ghost pirates (or dark skeletons, in case they didn't want a new mob).
This raid would have several waves of pirates ghost, and an event at the end when the captain appears... When this happens, the boat would fly a distance of about 10 meters (being able to go up with the cannon or from the maztile of a sloop).
When you beat the captain, he drop the key from his cabin and the ship will start sinking (10 minutes for the total sinking).
Wherever he goes, a big storm will follow.
