I Guarded the Forbidden Grounds for Five Hundred Years, Then Left My Sect to Become a Demon Cultivator

【Fantasy, invincible, no System, decisive and ruthless, rogue cultivator, pure satisfaction】 You say he's your junior apprentice brother, so I can't kill him? Sorry, if I don't kill him, I won't be at peace! You say he's my junior apprentice brother too? Sorry, I've already left the sect. How can I have a junior apprentice brother? You say you regret it? Sorry, what does your regret have to do with me? A hundred years of wasted time, all ending like a dream of yellow millet. Reborn after ten thousand years, I swear to reclaim everything that was taken from me in this life. I cultivate for myself alone! Anyone who stands in my way will be killed without mercy!