Apocalyptic Twins: Chronology of Heart Eclipse

If you're tired of mindless zombies and mind-blowing plots, here's everything you want. An absolutely rational apocalypse based on the three iron laws of "the law of scale attraction", "TN immune constitution" and "zombie mutant ecology". How do societies collapse? How does the organization rebuild? How to price human nature? Follow two absolutely immune people and witness a civilization split into two poles in the ruins: one side is the empire that believes in the "Law of Ember" and seeks to survive by expansion; the other is the Federation that practices the "Emerald Pact" and seeks to survive by hiding. This is a setting-driven, logically rigorous hard-core social epic. All the answers are in "Twins of the End of the World"