Tongue Twister

You place your finger to your lips and point at any creature within 30 feet of you. The chosen creature must succeed on a Wisdom saving throw or be unable to communicate verbally for the spell's duration. On a successful save, the creature maintains its ability to speak, but is forced to do so in a whisper. A creature that fails can still make noise, but only incomprehensible gibberish. It must also roll with disadvantage on any ability check that requires communication, and is unable to cast verbal spells. Any creature with whom the affected creature is attempting to communicate is unable to understand them for the duration.

At Higher Levels:

If cast using a 2nd level spell slot, you may target 1 additional creature for each spell slot level above 1st.