WoW Retail, Incredible Yak Army-Complete World Quests Fast, Kill Anything (Patreon)

 Patreon Baysik has contributed this amazing find and made a youtube video about it: https://www.youtube.com/watch?v=jhM6synFtfY&feature=youtu.be *

What you need to do is this:

1. You will need the quest "Liquid Courage". This is a way down the quest chain beginning with the quest "Mogu At The Gates" (it took me about 20 minutes to get to the relevant part of the chain). "Mogu At The Gates" itself requires completion of the Heart Of Azeroth chain up to completion of the retrieval of the black dragonscale with Wrathion in Blackwing Descent.

2. Enter the yak vehicle "Mobi". Leave immediately by using the exit vehicle button.

3. You should now have a yak pet following you. If you do not try again-sometimes it doesn't work due to timing issues. 

4. Repeat. 

5. Create Infinite Yak Army. 

(Note that I found a seesaw or cushion toy is not actually required as shown in Baysik's video). 

The Yak Army follows you everywhere in Pandaria. If you go too fast the yaks will de-spawn. 

The Yaks can attack and kill more or less anything but it isn't clear to me what criteria aggros the yaks. Sometimes they will attack something for apparently no reason. Sometimes they will just stand there. They seem to operate on some weird variant of "defensive" pet mode. 

With a little practice and adjustment to the peculiar yak  behaviour the yaks can significantly speed up world quests. 

*Legal disclaimer: this is an external youtube video. Third-party links do not constitute appropriation of art asserts held by Bliizard.