Serious question: What would be the real life equivalent

>vast glorious kingdoms/empires that has fallen into shit of walking husks
Iran, India or Indo-Iranian places in general

it even fits with the whole "fire allegory" since they used to have a big thing for that and need to rekindle that bonfire or bring forth a "Age of Dark", or do neither

hell, Indians/Afghans might aswell be hollows

africa.

Also probably shit like Atlantis or Hyperborea.

Pretty much anything from before 500 BC could be consider the "Mythical" era, since details are scares and legends are aplenty.

Ancient mythologies could also be compared to DaS, as the Gods and creation mythos play a large part in the lore.