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Cloudkill


School conjuration (creation) [poison]; Level magus 5, sorcerer/wizard 5, witch 5

CASTING

Casting Time 1 standard action
Components V, S

EFFECT

Range medium (100 ft. + 10 ft./level)
Effect cloud spreads in 20-ft. radius, 20 ft. high
Duration 1 min./level
Saving Throw Fortitude partial; see text; Spell Resistance no

By the way...
The effects created by this spell do not move with a ship.

Source Skull & Shackles Player's Guide