Healthy like an Elephant

The constitution among your people is formidable but you are a fountain of life even among them.

• Increase your Constitution score by 1, to a maximum of 20.
• Your hide hardens. While you aren’t wearing armor, you can calculate your AC as 13 + your Constitution modifier. You can use a shield and still gain this benefit.
• Your hit point maximum increases by an amount equal to your level when you gain this feat. Whenever you gain a level thereafter, your hit point maximum increases by an additional 1 hit point.