Frozen Age: I Can Upgrade Infinitely

The apocalypse is coming at minus 70 degrees, the world is frozen, and monsters are rampant. While others were shivering in the cold wind and fighting for a piece of bread, Lin Fan discovered that he could infinitely upgrade any item. [Old Hand Crossbow] → Upgraded to [Scorching Sun Divine Bow], melting a hundred meters of glacier with one arrow! [Expired Instant Noodles] → Upgrade to [Phoenix Spirit Meal] to permanently improve your physique! [Leaky Wooden House] → Upgraded to [War Fortress], impregnable! While the survivors were still fighting for a match, Lin Fan had already built a warm city that would never fall. However, this city of hope has become fat in the eyes of the powerful in the old era. They gathered an army of 100,000 survivors, marched to the city, and ordered him to hand over everything. "Hand over the city and spare your life." On the city wall, Lin Fan slowly raised an ordinary brick in his hand, shining brightly: "I forgot to tell you that this city itself was upgraded by me with a brick." As soon as he finished speaking, the entire city rose from the ground, the steel city walls extended, and countless self-disciplined defensive forts rose from the ground, their muzzles pointed at the invading enemy. "Now, who surrounded whom?"