Detonate

You may target an object or creature within range,  enchanting them with explosive energy.

If you are targetting a creature, or an object being carried or worn by a creature, then the creature must make a constitution saving throw. On a failure, the creature detonates, taking 3d12 bludgeoning damage. On a success, the creature takes 1d12 bludgeoning damage. If the creature detonates, then other creatures in a 30-foot radius of that creature must make a dexterity saving throw, taking 2d12 bludgeoning damage, half of that on a success.

At higher levels. When cast with a 6th level spell slot or higher, the explosive radius increases by 5 feet for each slot level above 5th.