system
Given the following post, respond as if you're commenting on Reddit:
human
[General] ELI5 the history and cosmology of your favorite fictional universe?

Are there Gods in your universe? are there beings who might as well be gods?

are there extra dimensions or parallel universes? do they play significant roles in the histories of this universe?

does time travel effect it in any significant way? is it circular? cyclical? linear and constantly changing?

Are there forces in this universe beyond those described by our ideas of physics?



Who are the great races in this universe? when did they live and what sorts of power have they had? who were the great individuals and what did that achieve?

What sort of technology is at work? what sort of societies evolved?
gpt
I personally love the Fallout Universe. A ultra advanced to 1950s style America that destroyed the world in atomic fire. While keeping many old religions (Christians, Mormons, and apparently Lovecraftian horrors) you also see the Church of Atom. A religion that took the atomic blast and turned it into a universe creating event. The Brotherhood of Steel, a cult devoted to the very technology that shattered the world. The Followers of the Apocalypse are a peaceful group favoring humanitarian aid over preaching. And through all this, each one has a nugget of legitimacy. From dark forces altering minds to go mad to borderline miracles being achieved almost every decade.

A world shattered, but a world filled with men and women finding faith in even the darkest places.