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    Acid Fog

    School conjuration (creation) [acid]; Level magus 6, sorcerer/wizard 6


    Casting Time 1 standard action
    Components V, S, M (powdered peas and an animal hoof)


    Range medium (100 ft. + 10 ft./level)
    Effect fog spreads in 20-ft. radius, 20 ft. high
    Duration 1 round/level
    Saving Throw none; Spell Resistance no

    By the way...
    The effects created by this spell do not move with a ship, but they do reduce the speed of a ship moving through them to half.

    Source Skull & Shackles Player's Guide