Brierskin

The skin of a willing creature you touch becomes covered in thick vines covered in sharp brambles for the duration. The target's AC can not drop below 14 and any creature that makes a melee attack against you takes 2d8 slashing damage from the thorns. When the spell ends, the vines wrap themselves around a creature within 10 feet of the target. The creature must succeed a strength saving throw or take 3d8 slashing damage, or half as much on a successful save.