FIXED : (
ACT III.
1. The siege of bastion´s keep
Light the beacons
Select this quest and go through the armory and main base to next objective.
There you can see a guard yelling something about lighting the beacons. Follow him until he stops and remember that location.
Meanwhile a group of 11 small creeps will run down the stairs. In few seconds a giant bomb will drop to the location where the guard stands, instakilling all smaller creeps and giving you all the xp.
As a smaller level you want to use the explosion, because you lack damage. Just kite the creeps to the explosion and enjoy free xp. Then phase back and instantly leave the game. When you resume you will be at the guards location and you can repeat the whole process. At lvl 25, and 50 change to next difficulty. For even faster leveling you can buy exp gear from auction and some solid weapon. I was able to kill all the smaller creeps even before the explosion at higher levels.
I leveled two of my alts with this method, its easy and extremely fast. I was able to to reach from lvl55 to lvl56 in only 15 minutes. At lower lvls it is as fast as azmodan farming. Running this at hell difficulty is MUCH FASTER THAN AZMODAN!
EDIT: wow thx for the attention read through the thread, some good guys added AHK macros for easy afk farming
EDIT2: There are several people who claim it is possible to do a lvl in 15 minutes, if you are not capable to do this don´t call me a liar.. IT IS POSSIBLE
EDIT3: Some people still confused, here is a pic, easy to do manually XXX if you use macro, make it so you achieve 11 kills most time