Sonic Attack.
It was one of the hardest forms of attack to defend against and also the most troublesome style of attack for Rogues.
Regardless if it was the melee professions' Rage Roar, Warcry, and Fear Roar or the spell casting professions' Roar, Infrasound Wave, Wail of the Banshee, etc., these attacks were all difficult to defend through conventional means. Unless you were supported with spells that had the ability to defend against sonic attacks, there was only one key factor to decide whether you would be able to defend against these attacks. That was if you had enough Fortitude to pass the Tests of Immunity. As far as sonic attacks were concerned, many of them were like variations of Lion Roar, and had little defensive means.
Even powerful Wizards suffer in this aspect as well!