Just did the fight now, and I have to admit it was quite scary - that Flame Breath took like 1/3 of my hitpoints so I was like "yea this is gonna suck...".

Never done it before, granted I did read a guide. But all we really did was have the tank (me) face the horny dude away from the party. When the nail spawned everyone, me included went berserk on it and managed to kill it before the Hellfire. Apart from that it was all just a matter of avoiding aoes.

I suppose I was lucky that we had a good healer and our dps werent the kind that stand in aoes and expect to just get healed through it.