Reincarnated as a Demonic Cultivator

In a realm where strength dictates destiny, Lin Wei was a prodigy, until betrayal by his closest kin left him brutally murdered. Now, inexplicably reincarnated as a nameless acolyte in a decaying demonic sect, his past brilliance is but a forgotten whisper. Stripped of his former cultivation, Lin Wei discovers a unique cheat ability: a 'Soul Library' that allows him to perfectly mimic and improve any technique he observes, provided he's willing to pay a dark price. This power, however, demands constant ethical compromise, forcing him to choose between his lingering humanity and the ruthless efficiency needed to survive. He seeks not just revenge on those who wronged him, but to rewrite his own bitter fate and carve a new path through a cultivation world steeped in hypocrisy and brutal power struggles. Can he conquer the darkness within, or will his new power consume him entirely?