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Incendiary Cloud

School conjuration (creation) [fire]; Level sorcerer/wizard 8, summoner 6; Domain fire 8; Elemental School fire 8

CASTING

Casting Time 1 standard action
Components V, S

EFFECT

Range medium (100 ft. + 10 ft./level)
Area cloud spreads in 20-ft. radius, 20 ft. high
Duration 1 round/level (D)
Saving Throw: Reflex half, see text; Spell Resistance: no

By the way...
The cloud created by this spell does not move with a ship, but the caster can concentrate to move the cloud along with a ship. This spell can start fires on a ship.

Source Skull & Shackles Player's Guide