Deafening Roar is a World ability, found in the Werewolf Skill Line.

Deafening Roar
4303 Instant Cast Target: Area Base Skill: Roar
CRIMINAL ACT Roar with bloodlust to terrify up to 6 nearby enemies, fearing them for 4 seconds and setting them Off Balance for 7 seconds. Your Roar also leaves enemies dazed, applying Major Breach and Minor Maim, reducing their Physical and Spell Resistance by 5948 and damage done by 5% for 10 seconds. While slotted you gain Major Savagery and Prophecy, increasing your Weapon and Spell Critical rating by 2629.

Deafening Roar is a morph of the Roar base skill. The other morph is Ferocious Roar.