Blood Lance

Runes open deep wounds on your body which form into a large lance of congealed blood. You may then make a melee spell attack using your spell casting modifier. As you cast the spell you must spend a number of hit die(up to 4), if this drops your health to or below 0 the spell fizzles. On a hit the creature takes 5d6 + the number rolled from your hit die. If this damage brings the creature to 0, you heal for half the damage of the spell as you absorb the blood of the creature.