Yeah, I presume you picked dreadful wrath as regional bonus feat. So that feat + the AoE fear from class feature turns the mobs (while charging with pounce attack) into frightened state for 7 rounds and then 3 more rounds as shaken (thanks dreadful wrath lasting 1 minute). Also barbarian fear AoE uses Str as save DC modifier so while raging it gets +2 bonus to save DC :P.<br/><br/>In future could take in 12th level impervious command so mobs are 1 round cowering before frightened and then later on shaken.<br/><br/>However, in this build your breath attack becomes mostly once per day deal and not get much a boost. But you would be quite scary badass (and resilient also with diehard and hit hard vs elves/drows with vow of vengeance). So choice is up to you :).