Barkskin (3ed PH)
Level: Drd 2, Plant 2 Components: V, S, DF Casting Time: 1 action Range: Touch Area: One living creature Duration: 10 minutes/level Saving Throw: None Spell Resistance: Yes (Harmless)
This spell makes a creature's skin as tough as bark. The effect grants a +3 natural armor bonus to AC. This bonus increases to +4 at 6th level and +5 at 12th level and up. DMs need to note that similar bonuses do not stack, so this spell will not stack with any natural armor that the recipient of the spell might already have.