Fantasy

Erwin reincarnated into chaos. As the only son of the crumbling Cavendish mafia family, he used the ruthlessness and strategies from his past life to pull them back from the brink of destruction. He secured their empire, silenced their enemies, and prepared for a life of luxury and power.
    Then, an old man with a white beard with a letter knocked on his door.
    It wasn't just 1990s England. It was the world of Harry Potter.
    But Erwin didn't panic. He adapted. With his arrival came the Reputation System—a cheat code that turns fame and fear into power.
    ...
    [System: Reputation Gained. Draw Initiated...]
    [Spell Drawn: Wingardium Leviosa (Mastery)]
    [Curse Drawn: Reducto (Shattered to Pieces)]
    [Gold Reward: Fantastic Beast Affinity (Legendary)]
    [Purple-Tier Reward: The Unforgivable Curse Set]
    ...
    Erwin isn't here to play schoolboy games. He is here to rewrite the hierarchy.
    Pure-blood supremacy? Sacred Twenty-Eight?
    “The wizarding world only needs one true noble house,” Erwin declares, swirling his wine.
    “And that is the House of Cavendish.”
    He is turning Hogwarts into his own criminal empire.
    Hermione: “To serve the Cavendish family is not servitude; it is the highest honor of my life.”
    Luna: “The Nargles were wrong... the light didn't fade. It just belongs to Mr. Erwin now.”
    Years later, when Voldemort finally resurrects and calls upon his dark army, he stands stunned in a silent graveyard. “Can anyone tell me,” the Dark Lord whispers, “why all my Death Eaters are kneeling before a Cavendish?”
    ...
    [Slytherin House + Timeless Elegance + Ruthless Ambition]