How Could My Time Travel Be so Difficult?

In Tianxuan Continent, there are many sects of cultivating immortals. Since the space ruptured 100 years ago, other worlds began to connect with Tianxuan Continent, advanced knowledge and culture began to pour in, and a prosperous age began. This year is called Xuanjing Year 0 In the 10th year of Xuanjing, the people have become increasingly dissatisfied with the deformed society, but due to the powerful force of the Xiuxian sect, they are unable to resist at all. In the 18th year of Xuanjing, the State of Qin began to circulate a physical technique that everyone could practice. However, due to its low level, few immortal sects paid attention to it. Until the Qin army pointed its finger at the Immortal Cultivation Sect...