A Skeleton Ship is a type of ship within Sea of Thieves, that is manned by NPC skeletons. They can be found in game (mentioned below), and have tattered sails, generally with green and blue lights. The skeleton ships are assigned a different cursed ball that they’ll shoot through a cannon at your ship, this is signified by a small flag located near the captains wheel.
The crews of the skeleton ships can be any of the currently existing skeletons (Gold, Flower, Shadow, Normal) and have a captain.
While attacking the ships, it’s important to note that they can repair their hull however, can’t bail out water. All curse balls work on the ships and the Chest of Sorrows also works in sinking them.
When found roaming the seas you’ll come across some that are passive, who won’t engage in a fight and others who will. They also spawn via a random event at your rear.