WOW: Fast Leveling 6-13 (Horde)

There is a new forsaken quest A Daughter's Embrace , where you should escort Lilian to the Crusader's Run
She has a ability that instantly kills any Scarlet mob at this area, so all you need to do is hit the mob and wait until she kills him (you get 100% Exp for that kill). I was able to get from 6-13 as a warrior in 10 minutes. If there are more than 3 mobs near Lilian, she instantly kill them all and you do not get experience.
Quest is part of the chain. If necessary you can abandon the quest and start it over again.