Hard To Kill

You never knew when to quit, and you aren't about to learn now. 

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

Power Through. While you are bloodied, you can use a Bonus Action to gain a number of temporary hit points equal to 5 times your character level. These temporary hit points last for 1 minute. While you have these hit points, you gain proficiency in all saving throws. You can only activate this ability once per long rest.