Thorned Weapon

The next time you hit a creature with a weapon attack before this spell ends, the weapon grows the thorns of a rose which are as hard as steel. The attack deals an extra 2d6 damage to the target: 1d6 being slashing and the other 1d6 being piercing. 

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the extra damage increases by 1d6 of radiant damage for each slot level above 2nd.