Wailing (3.5e Equipment)
From D&D Wiki
This property can only be applied to ammunition. A fired wailing weapon emits a terrible wail, forcing all creatures of 10 HD or less within 20 ft of its path to succeed on a DC 18 Fortitude save or die instantly. If any Fortitude saves succeed, those creature become panicked for 1 minute. All other creatures must succeed on a DC 14 Will save or become panicked for 1 minute. If any Will saves succeed, those creatures become shaken for 1 round. This is a mind-affecting fear effect.