Ambush Shard

You extend your hand towards your target and summon a small magical shard behind its back, which you ram into the target. Make a ranged spell attack. On a hit the target takes 3d6 force damage.

If the target does not see you casting the spell, you can make the attack roll at advantage.

Sneak attack can apply to this attack.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 for each slot level above 1st.