Ship Invisibility

By means of this spell, a wizard can cause the ship he is aboard to become invisible, along with all its equipment and all creatures aboard. While the spell is in effect, creatures aboard ship can see and hear each other and the ship itself, but creatures not aboard can see and hear nothing. A clever watcher, however, may notice the ship's wake, any disruption of water by its oars, if any, or other clues. People or objects that fall overboard, or otherwise leave the ship become visible; anybody or anything coming aboard becomes invisible. The spell is negated when anyone on board ship engages in any attack against anyone or anything beyond the ship. Traveling at ramming speed for more than two rounds will also terminate the spell. This spell is treasured among wizards who adventure on the Sea of Fallen Stars, and knowledge of its casting is closely guarded.

The material components of the spell are a splinter from the deck of the ship to be made invisible and the tentacle of a jellyfish.