Seriously. On Feng The Accursed we pop lust during the Flame phase. I have my Offtank (DK) tank him first and I go Boomkin/Caster form with an Int Potion and a caster weapon. And BOOM, I do anywhere form 5-7mil just wrath spamming in 45 seconds. This talent is amazing for the amount of damage it can put out for a tank when you arent the one being focused by the boss.