Dumbness

You can cause a creature to become mute. Choose one creature that you can see within range to make a Constitution saving throw. If it fails, the target cannot speak for the duration. At the end of each of its turns, the target can make a new saving throw, ending the effect on a success.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, you can target one additional creature for each slot level above 2nd.