Blades of Blood

You use your nails, claws, or bladed weapon to cut the skin of some part of your body before making the Attack. Using your blood, you create three crescent blades of crimson energy as you hurl them at targets within range. You can hurl them all at one target or at several, up to three. You suffer -6HP of damage casting this spell.

Make a ranged spell attack for each Blade. On a hit, the target takes (3d6)+SM of magical Slashing damage. 

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, damage increases by (1d6) and you create one additional Blade projectile for each slot level above 2nd and the cost increases by 2HP per higher spell slot.

*SM=Spellcasting Modifier.