Kind of using your idea of Undermine as a mega dungeon, I kind of envisioned our visit to the Worldsoul as the raid. An Antorus of sorts.
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I don't doubt that the two can't happen at the same time, but I truly wonder if we would ever see Undermine goblins without going to Undermine.
Without them doing a Nazjatar + Mechagon style patch, I wonder if there could be a situation where Orwenya rather raises her concern to us about the operation of the Goblins in Khaz Algar and Gazlowe (who is already in the process of rehabilitating the image of Goblins in a post Gallywix structure) decides to ask us to join him in visiting Undermine to make his case on Orwenya's behalf to the cartels. Upon visiting, we of course uncover something a tad bit more sinister in the works. Hypothetically some goblins repairing the dark heart, maybe interacting with brokers, etc. etc.
We do our thing there, and in our big act of heroism aiding Orwenya, she makes her big move of abandoning her own edicts and exposing her society and it's purpose to us, as she realizes we are all children of Azeroth and Elun'ahir was a gift for us all. Queue patch into the Rootlands where the black blood is infecting the very same roots which also happen to penetrate the chamber of the world soul, threatening us all.
Or something like that idk. I just really would like Undermine as a patch. I'm spit balling here guys.
There has to be some connection between Saronite, Kajamite, and Azerite.
Could Beledite be a thing now?
I'm not sure if this is just a reference to some art contest thing, but maybe we'll get (Red) Pandapeople in Rootlands? Just seems weird to introduce a new species as a pet only.
Also note the swirly root pattern.
Formerly known as Arafal
Still, though.
Saronite - the blood of Yogg-Saron, corrupts things around his domain in the northeast of Kalimdor.
Kajamite - the blood found around Ulduar and in abundance in the South Seas, particularly in the lava tunnels underneath Mount Kajaro.
Plot twist:
Yogg-Saron slew his sister, the one depicted on the mural in Azj-Kahet.
She was prior to that embedded within the hollow earth underneath Undermine, Khaz Algar, etc.
Her blood trail could be found all the way from Khaz Algar to Northrend.
The Goblins appeared around Northrend and became smart because of the Kajamite. Then they made their way south and settled on Mount Kajaro, due to the massive amount of Kajamite found nearby.
Over time, the Kajamite dwindled. They needed more. Ever deeper they went.
Until they found something which was never meant to be found. Now, the Goblins of Undermine have fallen to a peculiar corruption. Something from below influences them. Compels them to seek out Khaz Algar, and find Elun'Ahir.
To tap into the roots, and revive the fallen Old God.
It'd be kinda wild if the Earthen can't repair the Coreway and we can't find another entry point under Khaz Algar, but the goblins managed to expand enough of Undermine that some old back alley of the city crossed paths with either a cave or Titan ventilation shaft near the World Soul.
My Nintendo FC is 2208-5726-4303.By Blizzard Entertainment:
Part of the reason is that Battlegrounds are like ducks.
Maybe? I had a theory like this:
The Goblins attack the Harronir's home in 11.1, and the attack at the main area is the raid. During the 11.1 questline, Orweyna's adventure from 11.0.7 leads to her going to Kezan, namely the Undermine, where she finds the Goblins there are planning to enter Azeroth's Worldsoul from a secret, unique passage. We go to the Undermine, stop the mining process there, and learn that the Goblins (Namely Gallywix) made a bargain with Xal'atath, in exchange for power, wealth, and fame.
Then, after the whole ordeal at the Undermine, we struggle to find another passageway into Azeroth's Worldsoul, which would lead us to 11.1.7, where we figure out that the Undersea has a unique, dark passage into Azeroth's Worldsoul, but no one's ever ventured there before (Could have it to where not even the Titans ventured this deep into the world as well, but idk). So, for 11.2, we venture deep within the Undersea, and enter a unique, mysterious zone that's not shrouded by water or so. And from that zone, we go to the final raid of the expac.
Like my theory?
That interestingly falls in line with a story from a novel involving a Goblin miner digging too deeply beneath Undermine and encountering a void entity;
https://wowpedia.fandom.com/wiki/Rakalaz
And yes, it is canon.
Kyparite might also be interesting. Amber from the Kypari trees that blossomed all over Pandaria when the world was young, containing the "lifeblood of the earth", which the Mantid worshiped.
Sounds an awful lot like the Old God blood possibly being slurped up by Elun'Ahir.
They could have merged the undermine and rootlands patch es planned while Danuser was still there, so we get a new final patch planned by Metzen to better link the TWW finale with Midnight/The World Soul Saga.
Uldaz, whatever it is, must surely have been planned for a while.
The only real bridge we need is that something causes an awakening and/or some type of darkness, prompting Azshara to return (presumably as an invading force).
I think either an Old God resurrection, or the worldsoul itself being darkened like Beledar, or some Void Lord emerging.
Interesting to see that Siren Isle will experiment with a "hard mode" of sorts that prevents flying. Hopefully it's a success so it can be replicated across the entire world later. So much content that feels wasted when you just skip over it ignoring everything.
The world revamp dream will never die!