Reckless Casting

You can unleash the arcane power stored within your very bones, wielding magics in a new destructive way with little concern for yourself or surroundings. You gain the following benefits:

• Increase your Intelligence or Charisma score by 1, to a maximum of 20. 
• When you cast a spell of 1st Level or higher, you can expend a number of hit dice equal to the spell slot level used instead of spending the spell slot.
• When you cast a spell of 1st Level or higher, you can spend a number of hit dice and add the dice to the damage/effect roll of the spell, or increase the DC of the spell by 1 for each hit die spent. You take 1d6 necrotic damage for each hit die expended this way. This damage ignores resistance and immunity.