Heartripper

A plant fed with blood does not mourn, nor does it show mercy.
When you cast this spell, barbed thorns sprout from your fingertips. Make a melee spell attack roll against a creature within range. If you hit, the target takes 1d10 piercing damage and must make a Constitution saving throw. If they fail, you grasp a vital part of their anatomy and squeeze, inflicting an additional 3d10 piercing damage and stunning the target until the start of their next turn. If the spell attack roll resulted in a critical hit, the target has disadvantage on their saving throw.

At Higher Levels: When you cast this spell using a slot of 3rd level or higher, the piercing damage of the second phase of the spell increases by 1d10 per slot level above 2nd.