Point to another creature and shout the command word to cause the target to scream uncontrollably for the duration. The target has some ability to influence what they are screaming but it is largely unintelligible. 

While screaming, the target is naturally unable to cast any spells that require a verbal component and any creature able to hear within 10 feet of the target is also Deafent.

Creatures unable to speak are unaffected by this spell.

If they pass 10wis save then the spell has no effect.