To tank Archavon's buttocks

As a DPS warrior, I've come to hate the very sight of Archavon, especially his hindquarters. You see, Archavon has a terrible tendency to... how do I put this delicately... he tends to fart on the melee DPS.Okay, that wasn't very delicate, but it was accurate enough: Archavon expels a cloud of noxious fumes that does AoE damage and radically reduces the chance to hit for anyone standing in it.