Captain's Wager: The Maelstrom (2015)

A great storm ravages the skies, grinding airships to kindling and sending pirate crews scrambling. Whole crews are sucked in and spirits drift out, bringing curses and spreading chaos. as the haunting worsens, you risk losing your loot and being doomed to captain a ghost ship for all eternity.

Maelstrom is an expansion for Captain's Wager which adds:
4 Crew Cards
30 Haunt Cards
15 Treasure Cards

And a Haunt Mechanic giving players an extra resource to manage if they wish to resist the rising haunt levels and avoid becoming a ghost ship incapable of winning with mortal wealth.