Board Thread:Lore Discussion/@comment-26120918-20150227155352/@comment-121511-20150305171837

TiberCaesarAndRepublicOfTamriel wrote: I don't think they point to that in Skyrim or Morrowind - but that's a really neat idea and it's actually better than what's currently out there, IMO.

I'm pretty sure they're in a "dragon-break". http://www.uesp.net/wiki/Lore:Dragon_Break

I can't recall the exact source, but that was the entire point of Numidium to begin with. The Dwemer refused to believe that the world they lived in was real (which was partially correct), and thus became Numidium in order to destroy it. Whether it happened too prematurely or it didn't happen exactly as planned, that is ultimately still what happened: the souls of the Dwemer fused to become the Oversoul of Walk-Brass.