Thunderwave

A wave of thunderous force sweeps out from you.
Each creature in a 15 ft cube originating from
you makes a Con save.
On a failure, they take 2d8 thunder damage and
are pushed 10 ft away. On a success, they take
half damage but aren't pushed. The spell emits a
blast audible out to 300 ft.
At Higher Levels. Each extra spell slot increases
the damage by 1d8.