Flesh of WoodSource Occult Origins pg. 8
Element wood; Type defense (Su); Level —; Burn 0
Your skin toughens like timber, turning aside some blows. You gain a +1 enhancement bonus to your existing natural armor bonus. By accepting 1 point of burn, you can increase this enhancement bonus by 1. For every 3 levels beyond 2nd, you can accept 1 additional point of burn to further increase this enhancement bonus by 1 (to a maximum of +7 at 20th level). Whenever you accept burn while using a wood wild talent, First World energy causes your full natural armor bonus to apply to your touch AC for 1 round. You can dismiss and restore this effect as an immediate action.