Blood Sacrifice*

You sacrifice a portion of your life force to enhance your magical power. When you cast this spell, you take 1d6 Necrotic damage, which can't be reduced or prevented in any way. For the duration, when you cast a spell that deals damage, one target of the spell (your choice) takes an extra 1d6 damage of the same type as the spell’s normal damage type (your choice if there are multiple).

Using a Higher-Level Spell Slot. The damage you take and the extra damage your spells deal both increase by 1d6 for each spell slot level above 2.