Culling Sickle

You create a ghostly sickle that lasts for the duration and can strike out at your foes. The sickle appears hovering in your space and moves with you. When you cast this spell and as a Bonus Action on each of your turns, you can direct it to fly at and strike a creature within 30 feet of you. Make a ranged spell attack. On a hit, the target takes 2d8 Necrotic damage, and you gain Temporary Hit Points equal to half the damage dealt. After the sickle hits or misses, it returns to hover in your space.

Using a Higher-Level Spell Slot. The damage increases by 1d8 for each spell slot level above 3.