Wraith of the Apostate

Publisher's blurb:

This is the 80th in an ongoing series aimed to provide the overworked DM with ready-to run encounters. The PCs encounter a ghost ship, the Swift Shark, adrift on the high seas. Once a proud pirate ship, the crew fell to the deadly touch of the wraith of an apostate.

Being a shipboard encounter, it can be used in the Spelljammer setting with some minor changes. For example, the flooded areas of the ship could be areas with bad air.

It includes a history/background for the encounter, a map, and monster stats. The companion ZIP file contains JPEG versions of the maps (with and without grid), the Word file of the encounter, and a Fantasy Grounds Unity Module file.