Unbreakable

You gain the power to take the damage your receive and inflict it back upon those who oppose you.

By foregoing your attacks for a number of rounds up to your Constitution modifier plus 1 (Minimum 1), you can inflict x2 the damage you received during this time back upon an opponent as Force damage when you hit them with a melee attack. Once you make an attack, regardless if you hit or miss, you gain one level of Exhaustion.

This feat can only be used once per Long Rest.