Decimating Smite

The next time you hit a creature with a melee weapon attack during this spell's duration, you cause a flaming explosion around the target, and the attack deals an extra 3d8 radiant and fire damage to the target.

Additionally, all enemies within 5 feet of the target must must a dexterity saving throw, taking 2d8 fire damage on a failed save and half as much on a successful one.