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Resilient Sphere


School evocation [force]; Level sorcerer/wizard 4

CASTING

Casting Time 1 standard action
Components V, S, F (a crystal sphere)

EFFECT

Range close (25 ft. + 5 ft./2 levels)
Effect 1-ft.-diameter/level sphere, centered around a creature
Duration 1 min./level (D)
Saving Throw Reflex negates; Spell Resistance yes

By the way...
The effects of this spell do not move with a ship unless specifically anchored to the ship. Otherwise, a ship running into the effects makes a ramming maneuver.

Source Skull & Shackles Player's Guide