Confound Languages

You magically curse a creature so that is cannot communicate. Choose a creature within range. The targeted creature must make a Wisdom saving throw. On a failed save, whenever the creature communicates using spoken or written language, it appears they are using an unknown language. The creature cannot communicate except by magic, like the message cantrip or telepathy.

At Higher Levels. If you cast this spell using a spell slot of 2nd level or higher, the duration is concentration, up to 10 minutes. If you use a spell slot of 3rd level or higher, the duration is 8 hours. If you use a spell slot of 5th level or higher, the duration is 24 hours. If you use a 9th level spell slot, the spell lasts until it is dispelled. Using a spell slot of 5th level or higher grants a duration that doesn't require concentration.