Enhanced Thunderclap

You create a burst of thunderous sound that can be heard up to 1000 miles away. Each creature within range, other than you, must succeed on a Constitution saving throw or take 1d8 lightning and thunder damage. 

The spell’s damage increases by 1d8 when you reach 3rd level (10d8), 9th level (15d8),  15th level (20d8), and 20th (23d8)