Barkskin

Transmutation
Level: Plant 2, Ranger 2
Components: V, S
Casting Time: 1 standard action
Range: Touch
Target: Living creature touched
Duration: 10 min./level
Saving Throw: None
Spell Resistance: Yes (harmless)
Spell Points: 3

The creature’s skin toughens.

Barkskin grants a +2 enhancement bonus to the creature’s existing natural armor bonus.

The enhancement bonus provided by barkskin stacks with the target’s natural armor bonus, but not with other enhancement bonuses to natural armor. A creature without natural armor has an effective natural armor bonus of +0.

Augment: For every 2 additional spell points you spend, the enhancement bonus to the creature’s natural armor increases by 1.