Photosynthetic Skin

(Unearthed Arcana, page 94, DnD 3.5)

[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).