Mob seems to drop his hate list every few seconds and then attacks the next person that gets on his list. Not nice for healers.. Tank needs to be taunting like mad to keep him off the rest of the party.
Also drops Stellite Encrusted Thoracic Clay. This guy spawned as the roamer gnoll on the east side of the lava, among the burynai. I'm afraid I don't have a loc, but I'm pretty confident that gnoll was the PHer.