When I did this quest and got to 8 stone tokens, my fellow friend, only having 3, decided to be a pussy and said "he had to go".  I tried to solo the last of the two tokens as a 31 fire mage in dalaran, thinking it was easy, but with all the elemental slaves and summoners and all the aggroeing and dying, I decided to whip up thotbott.  Ignoring all the rogue complaints, I found that I should go to the internment camp, not dalaran itself.  With that, the enemies and aggroing got easier, the drop rate got better, and every thing was finally ok instead of everything being a disastrous mess.

So under any condition, do not make my mistake, and go to the internment camp, not dalaran.

and by the way, rogues, stop complaining.  if it is too hard, don't do it.  you are the one who made the rogue.