So, do we know where exactly The Fallen, Hive, and Cabal come from?
Also, how long ago was the Collapse (and how long was humanity's Golden Age)?
Lastly, are all of the people left just walking corpses, like we are? How did we not decay?
Any clarity (if there is any) would be great!
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I don't know about the rest but the ghosts reanimate remains on a molecular level. So you're not a corpse.