Pain-Hardened Focus

You are so accustomed to injury, you have learned how to turn pain into clarity. 

You gain the following benefits.

Ability Score Increase. Increase your Constitution score by 1, to a maximum of 20.

Your Turn.  When you take damage from an attack, you can gain Advantage on your next Attack roll against that creature you make before the end of your next turn. You can use this feature a number of times equal to your Proficiency Bonus, regaining all uses on a Long Rest.