Ship of Pearl

The keeper and their assistants can use the pearl of power to create a ship of pearl. The vessel is made in the following manner. Once each month, the pearl of power is ritually bathed in the seawater of the grotto. When all the seawater but one drop has evaporated, the keeper captures that droplet in a vial made of pearl fragment. This is repeated throughout the years until the vial is full of sea dew, a process that takes 100 years to complete. Meanwhile, a layer of pearl the width of one hand is chipped off each year and set aside for the future construction of the ship. More fragments can be collected if needed, but each in excess of the first reduces the pearl's power. 
When enough fragments are collected, they are mortared together into the shape of a ship. The cement is made of ground mother-of-pearl with half the sea dew mixed into it. Finally, at the right moment of the year, the ship of pearl is anointed with the rest of the sea dew, and the magical craft is ready to be used. 
The ship of pearl holds 10 elves. Obeying verbal commands, it travels on water to any place desired, moving 360 feet per round or 215 miles per day. The ride is smooth to those within the ship, regardless of wind, weather, or wave conditions. The ship can travel on fresh as well as salt water, and magically avoids navigation hazards such as islets and reefs. If such lies unavoidably between the ship and its destination, it stops short near the obstacle until told where to proceed.