After Billions of Years of Sign-Ins, I Became Invincible in Zhangjiajie

I update over 50,000 characters every day. That's 50,000, with four zeros at the end. If I fall short, feel free to curse me. I won't talk back! Lin Chang'an transmigrates to Zhangjiajie, the number one sacred site throughout history. He obtains the Longevity Sign-In System and can sign in once a day. Each sign-in can grant him all kinds of cultivation techniques, divine abilities, weapons, and even lifespan. [Congratulations, Host! You signed in and gained 100 years of lifespan, along with the Heaven-Devouring Devil Art. Once mastered, it can devour the heavens, the earth, and the universe. Nothing is beyond its reach!] Lin Chang'an: “Not bad, little System. I'll take this cultivation technique.” [Congratulations, Host! You signed in and gained 1,000 years of lifespan, along with the Spirit Herb Growth Acceleration Art. You can use your lifespan to make spirit herbs mature faster.] Lin Chang'an: “Let's start by maturing ten century-old spirit herbs. Wow, I only have 10,000,000 years of lifespan left.” The mature spirit herbs: “His lifespan seems poisonous. Lin Chang'an, you old schemer, you poisoned his lifespan. Were you afraid we'd grow legs and run away?” [Congratulations, Host! You signed in and gained 10,000 years of lifespan, along with the Lifespan Curse-Killing Art. You can expend your own lifespan to curse your enemies to death by draining theirs.] Lin Chang'an: “I remember having an enemy who's a Nascent Soul Ancestor, right? Let's try the thousand-mile curse-killing technique.” Nascent Soul Ancestor: “I really... thank you.” The next second, he was dead! And so Lin Chang'an quietly secluded himself at the sacred site of Zhangjiajie. Anyone who dares to become his enemy is the biggest fool under heaven! I, Lin, have a thousand ways to kill him.