Umbral Tendril

You create a long tendril of life-stealing shadow that lashes out at a creature in range that you can see.

Make a ranged spell attack against the target. On a hit the target takes 2d8 (avg 9) type=necrotic damage and you gain @variantrule[Temporary Hit Points|XPHB] equal to the damage dealt.

Using a Higher-Level Spell Slot. The damage increases by 1d8 (avg 4.5) for each spell slot level above 1.