Crimson Smite

Your blood is your weapon, but it takes sacrifice.

When you hit with a melee weapon attack, you can choose to expend one or more of your hit dice to empower your strike with your own life force. Roll the expended hit dice and add the total to the attack’s damage. You then take necrotic damage equal to the same amount rolled—this damage cannot be reduced in any way.

If this self-inflicted damage reduces you to 0 hit points, you immediately suffer two failed death saving throws, as the power you channeled tears at your essence beyond mere physical harm.