The End of the World: Eat Iron to Become Stronger? Start by Stocking up on Millions of Tons

[Shelter + Systemless + Building Power + Decisive Killing + Online IQ + Three Correct Views + Reasonable Logic] The apocalypse is coming, zombies are rampant, and alien beasts are raging. Humans awaken to their superpowers and can fuse steel to become stronger. However, Zhang Jin was framed by the goddess and reborn back to before the apocalypse. "Since God has allowed me to live a new life, how can I do nothing in this rolling torrent of the end of the world!" In this life, Zhang Jin built a shelter, gathered survivors, adopted the future national beast, the giant panda Huahua, and established the most awesome human federation in the world. Whoever is the craziest in the apocalypse, I will be the king wherever the long sword points!