[Ant Colony Invasion + Reborn at the End of the World + Armor + No System]
What would happen if the oxygen humans rely on to survive suddenly increased dramatically?
Reduced nitrogen dioxide leads to falling temperatures. People suffer from oxygen intoxication and even oxygen poisoning. Conventional weapons become useless, and high-tech civilization collapses completely.
And those are only the accompanying disasters.
The real danger comes from the ant colony and giant beasts that have grown in size.
Reborn, Li Xuan starts by taking everything from Liu Chen.
No mount? Take Liu Chen's.
No ant-core? Snatch Liu Chen's.
No food or water? Then take Liu Chen's shelter.
Li Xuan will take Liu Chen's bodyguards and opportunities too. He might even take Liu Chen's older sister... No, better not. Mo'er would fly into a rage.
After all, in the future Liu Chen killed Li Xuan's Mo'er and forced Li Xuan to blow himself up in front of the Ant Emperor.
Li Xuan seizes every advantage, rampaging through the apocalypse in golden armor and living a shamelessly happy life with Mo'er. But then he discovers that his rebirth may have been part of the Ant Emperor's scheme.