Battle-Tested Warrior

Your inner reserves of strength grant you the ability to shrug off wounds that would fell a lesser soldier. 

• Ability Score Increase. Increase your Strength, Dexterity, or Constitution score by 1, to a maximum of 20.
• Rapid Recovery. When you spend Hit Point Dice to recover hit points, reroll the die if it is less than or equal to your Constitution bonus.
• Unstoppable. You can use your Second Wind class feature instantly when you take damage (up to its normal limit of uses), but no more than once per turn. Any time you use your Second Wind, you also gain temporary hit points equal to your fighter level.