Global Cataclysm: Unlimited Upgrade of Refuge

The sun’s flares erupted, huge meteorites descended, the cataclysm was about to come, and the horrific scene of the ice age and the extinction of dinosaurs was about to reappear.

After Wu Di travels into this world, he will immediately face the end of the world!

Fortunately, he got the mechanical brain and opened his own refuge system, which can be upgraded infinitely!

Iron door→Mezzanine door→Alloy door→Laser channel…

Crossbow arrow shooting mouth → small caliber machine gun → large caliber machine gun → Thunderstorm machine gun → machine light gun…

Radiation protection suit → exoskeleton armor → mechanical armor → small mecha → giant mecha…

Crossbow and arrow manufacturing table→gun work table→gun production room…

……