Curse of Gi'bresh

You attempt to curse a creature you can see within range. The targeted creature must make a Intelligence saving throw. On a failed save, the target creature loses the ability to speak the languages it knows and can only speak gibberish, and any attempt to write a message comes out as an incomprehensible mess of scribbles. The targeted creature retains the ability to understand the languages it previously knew. If this spell successfully targets a spell caster, the spell caster cannot cast any spells that require verbal components.

This spell lasts until it is dispelled with a Remove Curse, Greater Restoration, or similar magic effect.