The abyss descends. Higher-dimensional alien beasts treat humanity like grass and livestock, and the entire planet becomes a barren hellscape.
Civilization has collapsed. Survivors huddle a kilometer underground, drawing blades over a mouthful of moldy rations.
Lu Yuan, a transmigrated logistics engineer, starts out with a leaky shelter, but awakens the god-tier [Seed of Civilization] technology tree!
While others chew on radioactive sludge, he dines on fresh, uncontaminated synthetic tomatoes in a temperature-controlled pod;
while others fight hand-to-hand with rusty pipes, he whips out an exoskeleton mech and a high-frequency electromagnetic blade!
"Short on water? Nanotech decomposition and recycling!"
"Short on power? Connect to the geothermal cold-fusion grid!"
"Besieged by a beast tide? Raise the floating fortress [Heavenly Gate] and overcharge the space-based planet-killer cannon!"
From a humble shelter to ruler of the surface, from stellar divine fire that ignites Jupiter's Great Red Spot to a colossal Dyson ring encircling the sun...
When the all-conquering abyssal interstellar armada arrives from light-years away, it will face thousands of strong-interaction-force warships and microscopic dimensional-reduction punishment!
Lu Yuan raises his sword beneath the stars and declares to the entire universe:
"Wherever the sun and moon shine is the territory of humanity! Whoever dares threaten our civilization will be exterminated, no matter how far away!"
[Hardcore Heavy Industry + Technology Tree Advancement + Infrastructure to Save the World + Dimensional Supremacy + Unrelenting Thrills]