You protect yourself with slivers of arcane energy. Until the beginning of your next turn, you have resistance to bludgeoning, piercing, and slashing damage. For the duration, any creature within 5 feet of you that hits you with a melee attack also takes 1d6 force damage.

Cantrip Scaling. The damage this spell deals to attackers increase by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).