Extreme Cold Doomsday: Can I Upgrade Items?

Solar activity suddenly weakened, the world entered an ice age, temperatures dropped sharply, and the human living environment suffered a serious blow. The zombie virus broke out and more than half of the world's population became zombies. Various mutated creatures appear, and mankind suffers an unprecedented doomsday crisis. When the end is approaching, Chen Xu gets the system and can upgrade items. He also awakened the strongest space power. He carried a knife to fight through the apocalypse and became a strong pillar of mankind. Lead mankind to rebuild civilization and end the apocalypse.