Your body have been conditioned with constant beatings, breaking and bruises. While not wearing armor, your AC equals 10 + your Constitution modifier + your Strength modifier. Additionally your arms, legs, knees and elbows are instruments of destruction. You roll 1d8 for the damage of your unarmed strikes, instead of the normal damage.
You have advantage on Constitution saving throws to avoid the effects of exhaustion. In addition, once a day during a short rest, you can remove one level of exhaustion or condition you have suffered.
Your hit point maximum increases by an amount equal to twice your level when you gain this feat. Whenever you gain a level thereafter, your hit point maximum increases by an additional 1d4 hit points