Cassian Rosier bears the weight of a legacy he never deserved—a near-Squib relegated to the fringes of a Sacred Twenty-Eight family, where mockery and contempt have become his constant companions. His existence hangs by a thread until a single spell fractures reality itself. The Cassian everyone knew ceases to exist. In his place awakens someone entirely foreign: a consciousness from another dimension, stripped of magic but carrying decades of pedagogical expertise and fragmented recollections of a "Harry Potter" series he'd dismissed as mere fantasy. Trapped within a destroyed reputation and void of genuine power, his singular objective becomes survival. Necessity forces Cassian into a lecture hall. Bluffing through a discourse on Lumos—a spell he cannot cast—he discovers an impossible truth. Knowledge flows from his students back into him, unlocking mastery through their collective learning. Then the dam breaks. Forgotten incantations surface alongside memories that predate his consciousness, fragmentary and disorienting. Some memories illuminate dormant magical theory. Others cut like blade-sharp shadows, raising a haunting question: is he channeling ancestral wisdom or inviting something predatory into his own mind? Positioned within Hogwarts as a professor, Cassian navigates competing demands: his family's exacting standards, his colleagues' justified skepticism, and a burgeoning power that amplifies with each spell imparted. Teaching becomes the path to mastery—and potentially to absorption by forces ancient and unknowable. A darkly witty power fantasy following an accidental educator whose teaching gift manifests as profound magical awakening, unveiling lost spellcraft and contested memories while managing dynastic expectations, institutional rivalry, and the possibility that his own students represent an existential threat.