Blackened Blood

After taking damage you bend magic to turn your spilled blood into a weapon.  Any creatures within 5 feet of you when you take damage must make a dexterity saving throw, taking 2d6 necrotic damage on a failed save, or half as much damage on a successful one. (dc= 8+prof+charisma)
Additionally you can continue to deal damage with your blood. As an action you can move the spilled blood that is initially centered around you up to 30 feet. The blood can make a melee spell attack against a creature with 5 feet of it. The creature takes 2d6 necrotic damage. The spell continues for a minute or until you have dealt damage equal to the damage you were initially dealt as a reaction.