Photosynthetic Skin
( Unearthed Arcana, p. 94)[Spelltouched]
Your skin toughens when it draws energy from the sun.
Prerequisite
Exposure to barkskin spell,
Benefit
Whenever you're outside during the day, you gain a +2 enhancement bonus to your natural armor (characters who don't have natural armor ordinarily have a natural armor bonus of +0).