A world-destroying natural disaster broke out, and 90% of humanity died instantly, but I activated the prehistoric civilization in my brain when I was about to die.
Unlimited resources: Move the entire ancient city at will.
Black technology: Anti-gravity fortress + climate control tower. While others are peeling bark, I turn on the air conditioner.
The truth about the destruction of the world: There is a warning of the collapse of the last civilization hidden deep in the continent...
The end is coming, others are just hanging on, and I have begun to save the world!