Ten Great Disasters, Number 04: Death Kingdom.
The phenomenon manifests as a strange active substance spewing forth like a volcanic eruption. Because of its properties, it is also known as the "Corpse River," "the undead," the "Nether River," and so on.
In its cooled state, the substance can divide itself, develop humanoid forms, and automatically integrate into the current social order. When activated, it instinctively replaces living organisms in their ecological niches and drives that civilization toward death. Investigations have traced the disaster's origins to the combined undead creatures from multiple dormant periods in the history of the Radiation Era.
Existing group-level anomalies [Doppelgängers] and individual-level anomalies [Candle Yin] have both been confirmed as remnants of it in reality, as well as its mutated offshoots.
Feeling the boundless Mental Power around him surge to its peak and then slowly fall silent, Han Su slowly closed the Emperor's Book in his hands and put it back into the Black Suitcase.
More and more knowledge from before the Reconstruction Era was beginning to enter his mind of its own accord.
In the erased history, civilization had not continued uninterrupted. The Radiation Era was merely a general term, and its precise duration could no longer be determined.
Over that vast span of time, civilization had sometimes mutated and developed in extreme directions, giving rise to aberrant forms such as the Copper Civilization, the Nurturing Civilization, the Individual Civilization, and the Faith Civilization. At other times, wars and competition between different groups had led to widespread desolation. Living creatures had vanished across vast areas of the world, turning it into a veritable graveyard of civilizations.
Yet even in those desolate periods, certain things remained active. The Death Kingdom was one such example.
In those days, living organisms had died on a massive scale,