The Librarian left a tool, not a weapon. Marcus Vael — UNSC analyst, involuntary Reclaimer-designate — wakes with a Forerunner Index bound behind his eyes, eight Geas-bearers scattered across the galaxy, and a Counter-Clock the Didact started ticking a hundred thousand years ago. Reach falls in eighteen days. Section III flags his communications by the second week. Field Master 'Rasamee answers his honor-debt before the Schism is named. Master Chief, Halsey, a nine-year-old civilian girl whose function the Index refuses to display — every name on the list dies in canon, and Marcus has one institution, one Index, and zero authority to keep them breathing.