ShipSkeleton is a small ship added by the Better Dungeons mod. This ship generates in Ocean biomes. Its sail takes the form of a skeleton's face.
When a player approaches the ShipSkeleton, two pirates will spawn. There is one pirate on the deck and one on the gangplank. These pirates are capable of dropping boats into the water and attacking before you enter the ship. Some pirates are armed with revolvers.
There is an empty cabin at the rear of the ship containing a ladder down to the hold/brig. There is one chest inside. The cells are inaccessible without breaking blocks.