Gibber

Vescavors yammer the endless chorus of the Abyss. Any creature within 15 feet of a vescavor swarm or inside it must succeed at a DC 15 Will save or be confused for 1 round. This is a mind-affecting sonic compulsion. A creature that saves cannot be affected by the same vescavor swarm's gibbering for 24 hours. The save DC is Constitution-based.