Cataclysm

When this spell is cast, Pick a point you can see. The ground in a one mile radius from the selected point begins to shake tremendously. The ground cracks and breaks then explodes into a mushroom cloud as if a nuclear bomb hit the location. 

Each creature in the spells radius must make a constitution saving throw DC 24. On a failed save the target takes 30d6 fire damage, 30d8 radiant damage, and 20d4 acid damage or half as much on a successful save.

In addition, each creature in the radius and 1 mile outside the radius (if looking at the explosion) must make a constitution saving throw DC 20 or be blinded and deafened for 10 minutes.