Blood Sacrifice

Upon putting a drop of your own blood on a small weapon such as a dagger, dart, or arrow, you can summon a blood creature to attack any enemy within 60 ft of you. Roll your hit dice, and deduct the number rolled from your current health. If this amount is more than your current HP, your character dies instantly. The blood creature summoned deals 5d10 damage, with an additional d10 per spell slot above level 5.