Backbite

You cause arcane power to slice against your target, hitting them where it hurts most.

Roll a ranged spell attack, with Advantage if there is an ally within 5 ft. of your target. On a hit, the target takes 2d6 slashing damage.

This spell fulfills the requirements for your Sneak Attack if you are no more than 10 ft. away from the target.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, add an additional 1d6 slashing damage per level of spell slot above 2nd.