Thorn Shield

You surround yourself with a shield of thorns that explodes upon impact. Creatures (other than you) within a 10ft. radius of you must succeed a Dexterity saving throw or take 2d4 piercing damage on a failed saving throw. Upon a successful saving throw, you take half damage.

At Higher Levels When you cast this spell using a spell slot of 2nd level spell slot, the initial damage increases to 4d4. For each level above 1st that you cast the spell, the damage increases by 2d4.