Bloody Bravery / Unyielding Grit

Sometimes all that's needed to light a fire with oneself is a rush of blood and a bit of pain.

As part of using the Indomitable feature, or instead of rolling a new save, you may roll a hit die plus your Constitution modifier, and add the total to your roll. As a result of the physical strain, you will take damage equal to the number rolled on the hit die plus your Constitution modifier. This damage cannot be resisted, negated, or otherwise prevented short of a boon expenditure