Arianne's Fragmentation

Up to 1 cubic foot of material made of wood, stone, diamond, metal, glass or something similar that is not being worn or carried is fragmented into smaller pieces of your choice. Any additional materials remain unaffected and fall harmlessly to the ground. Magic Items are unaffected by this spell.

If you are the target of an attack or take damage during the casting time, the spell fails.

At Higher Levels: When you cast this spell using a spell slot of 3rd level slot or higher, the amount of material that can be fragmented is increased by 1 cubic foot for each slot level above 2nd.