Amberstone Extras: Excerpt from “The Collapse & the Crucible: A History of the Subsurface World” by Sister Araminta, Order of the Amberstone.

  "The Great Panic of 2030 did not end with mushroom clouds, but in silence. What began as a race for protection soon became a quiet descent underground. The 'Reverse Cities' were marvels of ambition, funded by terror and eventually forgotten by the comfortable. When the panic ended in '35, the poor remained, inheriting steel sanctuaries built for the rich. Now, in 2060, these catacombs move more freely than any highway, and their people—those born under fluorescent suns—know all the hidden doors of the Earth."

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  — Entry #042: The Subsurface Migration