SRD:Thicken Skin

Your skin or natural armor thickens and spreads across your body, providing a +1 enhancement bonus to your Armor Class.

Augment: You can augment this power in one or both of the following ways.

1. For every 3 additional power points you spend, the enhancement bonus increases by 1.

2. If you spend 6 additional power points, you can manifest this power as a swift action.