Belrah's Bellows

You create a 20 foot line of thunderous sound, in a direction of your choosing, that can be heard up to 100 feet away. Each creature within the line, other than you, must succeed on a Strength saving throw or take 1d6 thunder damage, and be pushed to the end of the line.

The spell’s damage increases by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).