Stone Bones

Caster Level(s): Wizard / Sorcerer 2, Cleric 2
Innate Level: 2
School: Transmutation
Descriptor(s): Magical Armor
Component(s): Verbal, Somatic
Range: Touch
Area of Effect / Target: One undead creature
Duration: 10 minutes / level
Additional Counter Spells:
Save: Harmless
Spell Resistance: No

You cause the target undead to gain a +3 natural armor class bonus, due to the thickening of its bones.