The defense change season at Fengsha Pass is approaching. The elite battalion takes over the new armor, but the old battalion of the frontier army is sent to guard the narrowest Fengxia Gorge. Twenty-nine-year-old Chief Xiao Li did not wait for a better pair of armor. Instead, he discovered in a library of cracked iron that his spiritual power could be dispersed along the cracks in the old armor, allowing the broken armor in the hands of multiple people to temporarily connect into a shield at the same breathing node. But this shield is not omnipotent: if one person shoots it randomly, it will break apart in series, and the enemy will constantly change arrows, break paths, and cut materials. In order to allow the abandoned armor battalion to survive the defense replacement season, Xiao Li, the lame armorsmith Liang He, recruits Lu Xiaochuan, He Jun and others changed the scrapped armor into replaceable shield scales, turned the drumbeat of the pack team into a synchronized node for reconstruction, and connected armor repairs, trade routes, mineral materials and outposts into a truly operational defense line. The most difficult level came from Xiao Li's own old injury that refused to show weakness. When a hard carry nearly kills his deputy, he must learn not only how to turn cracks into a shield, but also when to hand over his position to someone else.
