Dismantle

By swiping your hand in an arch like motion you send forth wild slashes of arcane energy. Each creature and object in a 15-foot cone must make a dexterity saving throw. A creature takes 3d6 magical slashing on a failed save, or half as much damage on a successful one.

Objects and constructs who fail this saving throw take double damage. 

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 1st.