Evander's Thunder Cube

A sudden loud ringing noise, painfully intense, erupts from a point of your choice within range in the form of an intricate cube. Each creature inside of a 20-foot cube within range must make a Constitution saving throw. A creature takes 6d8 thunder damage on a failed save, or half as much damage on a successful one. A creature made of inorganic material such as stone, crystal, or metal has disadvantage on this saving throw. The caster must then make an ability check using their spellcasting ability. Any non-magical items that are not being worn or carried that are equal or below the rolled number are instantly reduced to ashes.