Necrotic Sacrifice

3rd-Level Artificer Feature

You learn how to use your own life essence to empower your damage dealing spells and your Necrotic Infusions, using sacrificial dice.
Sacrificial Dice. You have 4 sacrificial dice, which are d6's. A sacrificial die is expended when you use it. You regain all of your expended sacrificial dice when you finish a short or long rest. You gain another sacrificial die at 9th level and one more at 15th level.
Necrotic Spell. Whenever you cast a spell that does damage you can expend a sacrificial die to add necrotic damage equal to the sacrificial die. You take damage equal to half the sacrificial die rounded up.