Screaming Amulet:

As an attack action, the wearer can cause the amulet to emit a horrid psionic shriek that disrupts the brain waves of every living creature in a 15-foot-radius burst centered on the wearer (the wearer is unaffected). The shriek deals 7d6 points of damage, or half with a successful Will save (DC 17). Power resistance applies. Using a screaming amulet does not provoke an attack of opportunity. Activating the amulet costs 10 power points; if the wearer does not have 10 power points to spend, he or she cannot activate the item.
Type: Wondrous Item (psionic); Manifester Level: 7th; Purchase DC: 34; Weight: -.