After Qianye's confrontation, continue through the scenes showing Skyward City rising and its huge rotating mechanism. The route leads to Peng's reveal and the final battle on the bronze structure.

Face Peng on the elevated bronze structure in Skyward City. Peng attacks with mechanical wing blades, while the magnetic field changes your movement. Watch for the contextual action prompt during the fight; the PC capture below shows E. Use the button displayed for your control layout when that prompt appears. Continue through the battle and the city's collapse before the farewell sequence begins.