Reborn with a System: Slay to Rule

Arthur Kingsley is framed by the Empress Regent's faction, captured during a northern campaign, and reduced to a prisoner. At the brink of death, a modern man transmigrates into his body and awakens a task system. Using its rewards, he breaks free, turns the tables, saves Sophie John and Victoria Frost, slaughters the Frostscar Stronghold, kills the third prince, and returns victorious to reclaim power.