The Stirge

Remember seas: The ship memorizes a course
followed for the next 12 hours. The journey is
programmed into the ship's memory and
remains until it replaced by a new journey.
Raise Island: Conjures a slab of bare rock
1,000 feet square and 10 feet thick that
floats, immobile, on the surface of a body
of water. The water must have enough
surface area to accommodate the rock slab.
Duration: 7 days.