Thorns of Retaliation

As a reaction when you are hit with an attack from a creature within 10 feet of you, you cause thorn-covered, spectral vines to lash out at your attacker. The creature must make a Dexterity saving throw or take 3d6 piercing damage and have their movement speed halved until the end of their next turn. On a successful save, they take half damage and do not have their movement speed reduced.

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 2nd.