Blooded Healing

You target the wound that you want to heal within 15ft and the target can spend one Hit Dice to heal the target. Roll a Hit Die and add the target's Constitution modifier to it. The target regain hit points equal to the total (minimum of 0).

The spell’s healing powers increases by one Hit Die when you reach 5th level (2), 11th level (3), and 17th level (4)