Timed Explosion

You touch a nonliving item and chant an incantation, enchanting the item with explosive energy. The item remains enchanted until triggered. When triggered (as determined by the caster or a specific condition set during the casting), the item explodes.

All creatures within 10 feet of the item must make a Dexterity saving throw. On a failed save, a creature takes 1d6 fire damage and is knocked prone. On a successful save, the creature takes half damage and is not knocked prone.

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