You unsettle opponents with a dreadful roar as you attack.
Prerequisites: Animal or magical beast; Large size.
Benefit: Once per day, you can use this feat as a standard action. Your mighty roar affects every opponent within 30 feet of you that can hear your roar and has Hit Dice lower than yours. An affected opponent must make a successful Will save (DC 10 + ½ your Hit Dice + your Cha modifier) to negate the effect. Failure means that opponent becomes shaken for 1d6 rounds.
Source: Savage Species, page 37. Changed “a character level” in the second sentence to “Hit Dice” to be more generally applicable. Removed the last sentence of Benefit and hyperlinked the shaken condition instead.