Void Knife

You create a shard of void energy and fling it at one creature within range. Make a ranged spell attack against the target. On a hit, the target takes 1d10 piercing damage. On a hit the target must make a CON saving throw or be Poisioned until the end of your next turn and take an additional 1d10 necrotic damage

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, throw and additional Void Knife for each level above the frist