Some suppositions:
- The Tiste, Thel Akai, Imass, Jaghut, Jheck/Jheleck and Azathanai are native to their homelands as per the FoD map.
- The Eres, Deregoth and K'Chain are all native to what we consider to be "Wu", which may also somehow Burn's dream.
- Rancept tells Sukul that Burn dreams so that we all may live. Sounds like part of Krul's bargain ends up turning the lands of FoD from wandering into the separate lands of the holds (Darkness, Light, Ice, Beast, Shadow, etc), perhaps because of Errastas' meddling.
- The Imass are known to have inhabited Tiste lands:
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‘That’s impossible. There were never any Dog-Runners this far east.’
‘This wasn’t always Tiste land, milady.’
- We still don't know how old Burn is or how long she has been dreaming. We cannot be sure if she is Imass or Tiste. She is mostly tree in FoD.
- The Imass of the Tiste lands move south of the Tiste lands, and end up eventually inhabiting Wu/Burn's dream, somehow conflating the lands the Dogrunner Imass fled to.
- One of the themes of FoD is the destruction of nature by the Tiste.
- The Deniers (including the Shake) worship the River God, but the Imass that fled end up worshipping Olar Ethil because they see her in their Fires.
Final thoughts:
Burn dreams of the realm that is Wu. That realm is made up of where the eresal and eventually the imass have fled to.
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And the other realms/holds (ice, beast, darkness, light, shadow, dragon, azath, etc) are separated and kept from one another via "gates" through kruls bargain with the elient.
Kharkanas and kurald galain are assailed through the combined gifts of the terondai draconus gave mother dark, thus no protection and they weaken, though already dying from destruction of nature. Kurald Thryllan is inhabitable to all but but the liossan, shadow/Emurlahn is sundered, beast hold loses its gods, ice hold is left alone through jaghut apathy and hood's war on death; starvald demelain is sealed a la the otataral dragon, and perhaps the escaping dragons are trying to leave before being trapped for Tiam-knows-how-long. The andii and the edur flee to Wu in several phases, cuz there is no where else to go, and do battle with the k'chain either because they think they mean war or because it's tiste nature. The imass are faced with incessant war from jaghut and human tyrants, but humans just keep fucking and breeding and end up overwhelming wu through sheer numbers and through hold and warren magic.
I'm curious if the Holds are merely representative of the elder wanderings only, and they may have even got their magic mojo going around the same time as the warrens. From there, different elements of the holds evolved into the houses.
This is where my brain starts to leak out of my nose.