You place your hand to your lips, blowing through them in a terrible note. All creatures of your choosing within range must make a Constitution saving throw. If they fail, they take 1d8 thunder damage and are deafened until the end of their next turn. This whistle is audible up to 500 feet away, even in adverse conditions.

At Higher Levels: When you cast this spell using a spell slot of 2nd level or higher, the thunder damage increases by 1d8 per slot level above 1st.