Hemomancy

You have learned the secrets of blood magic, and granting you the following benefits:

• Increase your Constitution, Intelligence, Wisdom, or Charisma by 1, to a maximum of 20.
• Hemomancy:  You may expend a hit dice to infuse your spells with your blood. While concentrating on Hemomancy, your spell save DC increases by an amount equal to your constitution modifier. In addition, you add additional damage dice to your spells equal in size to the hit dice spent to enter Hemomancy. At the start of your turn, roll a die equal in size to the hit dice spent to enter Hemomancy. You take that much damage. (This damage does not cause a concentration check.)