Global Mutations, Unlimited Upgrades of Tanks

[System+Combat Pet+Apocalypse+Upgrade+Monster+Chariot] Incredibly cool article! More than a hundred years ago, a super radioactive cobalt bomb was detonated, bringing catastrophe to the world. More than a hundred years later, Lu Yang joined the expedition team for a surface survival expedition. All the other team members died at the beginning. Fortunately, he awakened the system in time and signed in to obtain a tank that can be infinitely upgraded. Deal with the invaders such as the Asan Kingdom, Japan Kingdom, Dabang Kingdom, and the United States, kill them! Treat mutants and mutant beasts, kill them! The protagonist is cruel, not for the faint of heart!