Babble

2nd-level illusion
Casting time: 1 action
Range: 60 feet
Target: 20-foot-radius within range
Components: V, S, M (a pair of fish lips)
Duration: Concentration, up to 10 minutes
Classes: Bard, Wizard
Subclasses: Bard (College of Bells)

For the duration, you twist the perception of verbal language inside a 20-foot-radius sphere centerred on a point you choose within range. Choose one of the following effects when you first creatre the sphere:

• Any creature entirely inside the sphere can only speak nonsensical babble, understandable by no one. Casting a spell that includes a verbal component is impossible there.

• Any creatures entirely inside the sphere can speak to one another as normal, but creatures outside the sphere perceive their speech as nonsensical bable. Casting a spell that includes a verbal component is possible there.