As long as he gained the recognition of the ancient Fey column, Yi Yun could open an entrance.
It was only through recognition and not his insight. Of course, attempting to open the door through violence was out of the question.
The twelve ancient Fey columns might take several hours, days or even years to give a person its recognition. It might never happen for all eternity as well.
As for Yi Yun and the cultivators that came from the Fire Cloud State, they only had a day's time. After them, there were other cultivators from other states that were arranged to come here.
Due to the short amount of time, many people would likely fail.
Cang Mang did not tell them how to open the ancient Fey columns, so as Yi Yun touched the ancient Fey column, Yi Yun guessed that there were many ways to open the columns.
