Doomsday Mecha: Lance Penetrates Everything

[Mecha + no system + real system + slow heat + post-apocalypse] By the 140th year of Guangyuan, humans had been wandering in the mobile city "Imperial City" for two hundred years. What drives them is not storms or famine, but "armored beasts" - semi-mechanical behemoths hundreds of meters long and driven by high-dimensional energy. The global surface has become a hunting ground of scorched earth and light flow fog, and the survivors huddle in thirty-two giant mobile fortresses, cruising endlessly along the energy tracks left over from the ultra-ancient times. In this world shrouded in optical fog, radar and radio are useless. You can only rely on your eyes to lock on to the target, and the armored beast's defensive force field is enough to deflect all light beams, but it cannot block the most primitive physical impact. Mechas are forced to fight behemoths within visual distance - long-range weapons are just appetizers, lances, giant swords, spears, and halberds are the main dishes on the table. The specialized weapon of each god-control body is a living weapon. The spear tip is forged from high-density topological alloy. When amplified, a dazzling golden light pattern is outlined along the edge of the blade. The battle is not about hiding behind a bunker and pouring out firepower, but about rushing into the tentacle sea at several times the speed of sound, piercing the king beast's carapace with a lance, and then pulling out the claw blade to continue tearing everything apart. This is the only grammar of this war that has lasted for two hundred years: use the heaviest cold weapons to find a way to survive within the distance between steel and flesh.