The North becoming the land of weird sapient animals is a cool thought. What's next after Griffons and Mammoths?
My guess?
"Have you found that which you seek then?" he asks the Elder, taking the criticism with ease and committing it to memory.
The hooded dwarf was silent for a while still, staring out into the crystalline desert, Drakk bones larger than any living thing had seen in aeons, jutting out of the multihued sand.
"Of a sort Beardling," the dwarf rumbled, sheathing his burning blade, "of a sort. Omdra was too arrogant to be bargained with, but her eldest daughter was not. Regardless, just know that you will have your fire when the time comes. Hurry along now, this strife will not be quelled with our dallying."
The cavern rumbles around them, the sounds of battle echo through the halls and galleries above. The roar of dragons intermixing with the bellow of bulls over the din of Khazalid chanting and screaming.
"Come," the Ancestor orders, hefting his blade and picking up Astrogoth's head, "Our work is not yet done here."
Dragons.
Probably not on the level of the North Dwarfs-Griffons relationship. But the East Dwarfs might have occasional friendly dealings with Omdra's daughter's brood. Or maybe it was a one-time thing.
EDIT:
The current situation is basically what happened to the Eastern Dwarfs in canon. They were able to take over and establish themselves as they have in Dum because of how isolated it is. There are no other Dum's though, this is basically the Chaos Dwarfs last hurrah and attempt to be a separate faction that can operate in the open thus allowing for the beast men slave army.
Once we finish here the Chaos Dwarfs as we know them in canon simply won't be possible because if they become able to do the same thing they have here and takeover a Karak they would have to hide themselves if they don't want the rest of Dwarf kind to come down on them which means no slave armies which means no need for creating superior slaves which means no Black Orcs.
I hope so, though I don't know for sure.
"This battle draws to a close, but the war continues. I saw only three of his apprentices present before we assaulted them. The other five, they're still out there, biding their time until sorrow returns and faith falters. You must remain vigilant," he says.
After all, Gazul said that there were apparently
five apprentices unaccounted for. For all we know, the other 4 went the equivalent of deep underground and secretive, rather than trying for a last gasp major attempt.
So we could see this happen as many as
4 more times. If not more, if they leave successful apprentices or lineages of their own.
Maybe another will start enslaving Orcs instead of Beastmen. Or enslaving, or using as cats' paws, humans.
Or maybe they'll try to start something between the Dwarfs and the High Elves. Wouldn't that be ironic? It's not like the Dwarfs would want to be upfront about what's going on, after all. Especially since this isn't a huge split-in-half civil war which is impossible for them to hide or ignore; instead, it's a private shame and a threat that skulks in the shadows and depths and spreads faithlessness and preys upon desperation. It's the very epitome of a dark secret.
I have a feeling that if the Dwarf-High Elf war comes, it'll be a lot nastier for some Dwarf Holds. As they'll risk falling to Hashut as a consequence of the War or the Time of Woes that follows.
Or maybe they'll try to target the Brana. Figuring that if they can sacrifice their Ancestor-God, maybe they'll be able to resurrect Hashut.
Or go steal from the Lizardmen, thus getting the Slann pissed at the Dwarfs.
. 
