The material below is Open Game Content from a 3PP Product.
DEAFENING SPELL [METAMAGIC]
You may infuse your damage-inflicting spells with a secondary effect that envelops your target in a localized sonic burst that deafens only the targeted character or creature.
Benefit: Opponents injured by a deafening spell must make a successful Fortitude save (DC equal to your caster level plus Intelligence modifier plus the spell’s base level) or become deafened for a number of rounds equal to the actual level of the spell cast. Sonic resistance and immunity affects the results of a deafening spell. A deafened spell uses up one spell slot three levels higher than the spell’s actual level.