Based on folk tales, the Gate of the Hell was the holy land of the "Hell" and guarded the path to the real hell.
The Hell might reappear in the Nine Realms when the Gate of the Hell opened.
"Lian Qingyi, did you mean that the Gate of the Hell has appeared but not opened yet? And the Hell caused all the troubles in the Nine Realms in order to attract the cultivators here to open the Gate of the Hell for them?" asked the cultivator from the Sky Reaching School. Other people also looked at Lian Qingyi. They all interpreted her words the same way.