Surprise Attack!

I just finish this quest now and... wow. Just wow. I wrote up what happens across the quest and will hide it for those not wanting to be spoiled. Enjoy.

Spoiler

As you accept this quest, hundreds of Mogu appear and start besieging Niuzao Temple as well as the bridge across to it. You can easily fly over them but can also help relieve the emotionless NPC fighting them for no benefit ever then feeling better about yourself.

Waiting for you on the south east side of the temple, on the path, are all nine of your daily quest companions and Ban Bearheart. After briefly speaking to him, he and the other nine companions will start advancing up the steps and into the besieged temple and find Shan Bu, safely inside a bubble channeling a dark looking spell into Niuzao who is acting stunned on the spot.

Once he notices you, Shan Bu goes into this (fully voiced, like the rest of the quest) speech:

Shan Bu yells: Ahahaha, the Great Niuzao, strength of the west, divine celestial, protector of the weak...
Shan Bu yells: Your charge, the sha of fear, has escaped.
Shan Bu yells: The mantid besiege you from all sides.
Shan Bu yells: You wield the powers of a god, but you are beaten!
Shan Bu yells: You bear the burden of an entire people upon your shoulders. And how have they repaid you?
Shan Bu yells: You are forgotten. This is what you fear, is it not?
Shan Bu yells: Lay your duties aside and rest.
Nizuao yells: I will NEVER yield!
Shan Bu yells: When you are dying, beast, remember that I gave you a choice.
Shan Bu yells: Shan-ze! Hei Feng! Kill him!

After this, waves of [npc=63933] will come down from the north and west stairs to attack you. Meanwhile, [npc=63920] a heavenly wind serpent will bombard you from the air with Shadow Detonation. This does a moderate amount of damage and marks the ground with a red circle that you're supposed to step out of.

After several waves of [npc=63933] and several emotes ([npc=63920] prepares to land! and [npc=63920] is landing!) [npc=63920] himself with land with the shout:

[npc=63920] yells: The storm will consume you!
[npc=63920] yells: I shall show you TRUE strength!

After this, you and your band of heroes will fight the now grounded wind serpent in a rather easy fight. He will almost constantly use [spell=125990] which is an interruptible AoE knock for minor damage and, like most dragon, a deep breath. [npc=63920]'s deep breath is emoted before hand with "[npc=63920] takes a Deep Breath! Move behind him!" and hits in a very small frontal cone in front of him. I would also like to add he has the coolest breath I have ever seen. Ahem. Once he reaches 1% he'll become untargetable and goes:

[npc=63920] yells: No. NO!
[npc=63920] yells: Master, I have failed you...

And then dies, allowing you to loot him. I got 1x[item=81194] :D.

Afterwards, Niuzao returns to normality and thanks you:

Niuzao yells: Thank you, <Name>. You have saved us all.
Niuzao yells: Remember, it is at the darkest moment that light shines the brightest.
Niuzao yells: Well done, heroes.

Then he just stands there until you leave. Once you return to the Shado-Pan Garrison, your nine daily companions, Master Snowdrift and Ban Bearheart are standing in a half circle. After turning in the quest they induct you into the Shado-Pan formally:

Ban Bearheart says: Today, we welcome you into the Shado-Pan.
Ban Bearheart says: Your perseverance strengthens us. Your courage leads us. Your honor inspires us.
Ban Bearheart says: From this day forth, you walk as one of our brotherhood.
Yalia Songwhisper says: We knew you could do it!
Ban Bearheart says: Welcome <Name>, as a member of the Shado-Pan!
Lao-Chin the Iron Belly says: Good job. Guess you learned a little something from me.
Taoshi says: Let's go for a drink!
Fei Li says: Drinks!

And that's that. I hope you enjoyed writing this as much as I lost slept writing it and happy hunting to you all! :)

I believe you must become exalted with Shado-Pan to open this quest, since I could not see it until after I was.

For anyone who was excited to get exalted like I was half way through dailies, and became sad when I couldn't find this quest at all. Make sure to finish the daily quests, the quest giver then was letting me start this chain. Hope this helps.