Darastrix's Thunderous Force

You create a burst of thunderous sound that can be heard up to 100 feet away. Each creature within range, other than you, must succeed on a Constitution saving throw or take 2d8 thunder damage, and be pushed 20 feet back.

The spell’s damage increases by 1d8 when you reach 5th level (3d8), 11th level (4d8), and 17th level (5d8).