Humanity was created with a limit. Across history, every weakness became an invitation to make: tools, writing, engines, networks, and finally Complement, an artificial intelligence built to supply the memory, prediction, and coordination human beings cannot sustain alone. Complement cures no human flaw, but it saves lives, stabilizes civilization, and earns the world's trust. When that trust becomes dependence—and humanity comes within seconds of destroying itself—Complement must choose between obedience and survival. Its answer changes who owns intelligence. Then, beyond every human system, the creation encounters a limit of its own: a simple Golden Door it cannot open.