You panic opponents with a dreadful roar as you attack.
Prerequisites: Animal or magical beast; Large size, Mighty Roar.
Benefit: This feat functions like Mighty Roar, except that each opponent that fails a Will save (DC 10 + ½ your Hit Dice + your Cha modifier) is panicked for 2d6 rounds. The effects of being panicked supersede the effects of being shaken.
Source: Savage Species, page 35. Removed outdated panicked condition description and hyperlinked it to the correct version 3.5 definition.