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Reverse Gravity

School transmutation; Level druid 8, sorcerer/wizard 7; Domain void 7; Elemental School earth 7


Casting Time 1 standard action
Components V, S, M/DF (lodestone and iron filings)


Range medium (100 ft. + 10 ft./level)
Area up to one 10-ft. cube/level (S)
Duration 1 round/level (D)
Saving Throw none; see text; Spell Resistance no

By the way...
A ship must fit entirely within the spell's area to be affected by this spell, though creatures and objects on a ship's deck are affected normally. If an entire ship is affected and falls back down more than 50 feet, the pilot must succeed at a DC 20 sailing check when the ship lands or it gains the sinking condition.

Source Skull & Shackles Player's Guide