bomb

A item of your choice is transformed into a time bomb from a item of your choice within range. Each creature in a 30-foot-radius sphere once the bomb goes off must make a Constitution saving throw. A creature takes 6d6 explosive 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.

A nonmagical object that isn't being worn or carried also takes the damage if it's in the spell's area.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 4d4 for each slot level above 2nd.