Warning: This is 3.0 Edition material. It is possible that there is more recent 3.5 Edition version.
Inaccurate?

Greater Mighty Roar

( Savage Species, p. 35)

[Monster]

You unsettle opponents with a dreadful roar as you attack.

Prerequisite

Mighty Roar (SS) , Animal or magical beast; Large size,

Benefit

This feat functions like Mighty Roar, except that each opponent that fails a Will save (DC 10 + 1/2 your Hit Dice + your Cha modifier) is panicked for 2d6 rounds. A panicked creature takes a -2 morale penalty on attack rolls, saves, and checks, has a 50% chance to drop what it is holding, and runs away from you as quickly as it can. The effects of being panicked supersede the effects of being shaken.