Under the guidance of Bai Yijian, the five of them walked down the flight of stairs and went deep underground. About an hour later, they finally stopped after reaching a place of unknown depth.
Their location was not the end of the flight of stairs. Instead, it was a giant cave that was created by men halfway through the flight of stairs. As for the flight of stairs, it still extended deep into the underground.
The deepest part of the flight of stairs was the place that contained the Legacy of Materials, the last legacy. Looking at it from their location, it was more strictly guarded compared to the other legacies.
The cave they were in was fortified by the clansmen who guarded the five mountains. If any person were to follow the flight of stairs down, he would definitely be pursued by all the clansmen. Hence, entering the place that contained the Legacy of Materials unbeknown to anyone was as difficult as ascending to the sky.