(Shining South)

Level: Druid 3, Ranger 3, Sorcerer 3, Wizard 3,
Components: V, S,
Casting Time: 1 standard action
Range: Medium (100 ft. + 10 ft./level)
Target: One creature
Duration: 1 round/level
Saving Throw: Fortitude negates
Spell Resistance: Yes

You cause a creature's natural armor to crystallize and become brittle.
Whenever the affected creature is hit in combat, part of the crystallized hide cracks and shatters, dealing it additional lethal damage equal to its natural armor bonus.
Thus, if a creature with +3 natural armor is affected by this spell, it takes an extra 3 points of damage each time it is struck by a melee, ranged, or natural weapon.
The creature's actual Armor Class does not change.