Agony Lancet

You hurl an arrow of black and red energy from your hand at any creature within range, piercing them with the force of your pain. Make a ranged spell attack against the target. On a hit, the target takes 3d6 magical piercing damage and the target creature must make a wisdom saving throw. On a failed save, the target creature becomes hexed with this painful energy and takes 2d4 necrotic damage at the start of each of their turn as the wallowing energy seeps into them. They can continue to make this saving throw at the end of each of their turn. 

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 and 1d4 for both the magical piercing and necrotic damage.