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Gaseous Form

School transmutation; Level alchemist 3, bard 3, magus 3, sorcerer/wizard 3; Domain air 3; Elemental School air 3

CASTING

Casting Time 1 standard action
Components S, M/DF (a bit of gauze and a wisp of smoke)

EFFECT

Range touch
Target willing corporeal creature touched
Duration 2 min./level (D)
Saving Throw none; Spell Resistance no

By the way...
A creature in gaseous form does not move with a ship.

Source Skull & Shackles Player's Guide