Blood Magic

You have learned to cast powerful spells fueled by your own life force.

When you cast a spell, instead of expending a spell slot, you can expend and roll a number of Hit Point Dice equal to twice the spell's level and you take force damage equal to the roll's total. You do not take that damage if the spell has the ritual tag. When you cast a spell in this way, you can give one target of the spell Disadvantage on saves against the spell.

When you finish a short rest, you regain a number of Hit Point Dice equal to your proficiency modifier.

You always have the Warding Bond spell prepared and you can cast it without material components.