That's right, folks. I've figured out how to get unlimited pets to do your bidding in Pandaland. Solo anything in the game, including the new world bosses. Use at your own risk. This exploit is pretty game breaking.
What you need:
Any kind of character (presumably, though only tested with Rogue) with the quest "Last Toll of the Yaungol", available in Townlong Steppes from the NPC Xiao Tu. (Last Toll of the Yaungol - Quest - World of Warcraft)
And that's really it. Simple, eh?
What you do:
After you pick up the quest, Xiao Tu will start following you around. If you attempt to leave the area "Hatred's Vice", Xiao Tu will despawn. When you re-enter, Xiao Tu will reappear. But! If you enter the zone, then immediately leave it while Xiao Tu is doing his sit up animation, he will follow you out and stay by your side. Upon re-entering, a new Xiao Tu will appear. You now have two of the little fellas following you around inside Hatred's Vice. Should you attempt to leave, the newest Xiao Tu will despawn, but not the other.
So I'm sure you can fill in the blanks here, but I'll spell it out for you. If you continually move between Hatred's Vice and another zone, you can continue to get more and more Xiao Tu's to follow you. They do pretty good damage (15k+ crits).
What can I do with them?:
Good question. For starters, you can go solo the world boss. After charging my army of Xiao Tu's for ~10 minutes, they were able to auto attack the Sha of Anger down 5% of his health in about 30 seconds. He summons adds and mind controls though and I didn't really have much self healing, so I died. And if you die, they all go bye bye. But in theory if you could sustain yourself for longer you could have your adds DPS them. They can hold aggro, as well! Or, you could just charge them up for an hour and then have them go in and blow him up in 30 seconds.
As for what else you can do? Well I haven't tested to see if they will attack the opposing faction (I'm not sure if quest pets like this ever do, though). Edit: Tested PvP in a duel. They DO attack other players. Enjoy 1 shotting people. If they did you could run around 1 shotting people (I was 1 shotting 800k life enemies with my group. And if you tag them you get experience. And you can loot!)
These pets will follow you around all over, including out of the zone Townlong Steppes. Gotta run though, as I assume they despawn if you take a flight path.
Skeptical?:
Screenshot:
Attachment 10453
Video:
http://www.youtube.com/watch?v=hOniv5XTgnA
Video 2 (showing mob tagging):
http://www.youtube.com/watch?v=UY8KjxfZGbo
Drink safely, my friends. Just happy I finally got a chance to contribute something.