When an of-age transfer student arrives at Hogwarts with the long-forgotten ability to wield Ancient Magic, the castle itself begins to stir. Assigned to privately tutor them, Defence Against the Dark Arts professor Remus Lupin must help control a power shaped by emotion rather than spells. As old trials awaken and outside forces take notice, restraint, secrecy, and choice will decide whether Ancient Magic is mastered, redefined, or lost.