Gu Yang transmigrated to a fantasy world and obtained a system for modifying production dates. From then on, Gu Yang embarked on a path of unlimited modification and cheat-like power. [You have modified your cultivation to billions of years in the future, breaking through the limits of the Immortal Emperor and reaching the realm of the Eternal Dao Ancestor!] [You have modified your cultivation technique to billions of years in the future, successfully comprehending the Supreme Sword Scripture, capable of reversing time and fate.] [You have modified the bloodline of your pet white fox to billions of years in the past, successfully awakening the ancient nine-tailed celestial fox bloodline!]...