Final Threshold

On March 17, 2147 AD, purple aurora appeared all over the world at the same time, lasting for 7 minutes and then disappearing. Three days later, the first rift appeared in Tokyo and swallowed up the entire Ginza. Since then, the rift has spread in the order of "city→suburb→township", and human settlements have dropped sharply to 7% of the original level. The energy source that drives replica formation. Appears as a purple mist that slowly corrupts everything it touches. When humans are exposed to the tide of nothingness for more than 30 minutes, their bodies begin to "liquefy" and their consciousness will be absorbed by the copy and become a "void spirit". **The reason why the wanderer can travel through the tide:** It is not that he is born immune, but he has mastered the "tidal rhythm"-the concentration of the void tide fluctuates periodically, and he can quickly cross it during the short window period of the concentration low. This requires extremely high levels of perception and experience, and the mortality rate remains high. People who are completely swallowed by the tide of nothingness will die physically, but their consciousness will not dissipate immediately. In the gap between the copy and reality, an existence called "reverberation" will be formed - not a life, not an ethereal spirit, but a trapped memory fragment** that constantly repeats the last moments before death. Reverberation can briefly manifest (sound, image, or even touch) when the tidal concentration is high enough, but cannot truly communicate with the outside world. **The final destination of all reverberations: the source of the tide of nothingness, an "other shore" composed of death memories.