I wasn't exactly sure if this was a exploit? but i guess it is since you can't pull the mob up there without abusing mind control to stop the mob from running back to it's spawn. Also hopefully this isnt a repost i wasn't able to find a post about it.
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Basically you need a priest and preferably also a high HP tank for the best results.
Your priest is going to find a Manifestation of Pride, they are all over Vale of Eternal Blossoms, they have a spell Sha Corruption Which puts a puddle under the target and deals 5% of the targets HP to everyone standing in the puddle. So get your priest to mindcontrol the add and move it to shrine (it will take a while since mind control will break and you need to reapply it all the time) when you're at the destination where you want to unleash your puddle of doom ( ) have the tank taunt the add so it does sha corruption on him. It only needs to cast once and pretty much everyone should die if your tank is high enough HP. Also dont mindcontrol the add after it has casted sha corruption, simply let it die. Since if you mindcontrol the add again it will reduce the damage people take from the puddle significantly.
Did this at the innkeeper, it's funny seeing all the AFK'ers melt away ^^
Edit: So it seems you can do this without a priest then with any non damaging offensive ability... however if you dont want people to damage your add before its in place i guess mindcontrolling it is still the best way