"Yet the Death Qi would eventually be exhausted. In the end, the former Marquis of Wencheng breached Wencheng. To avoid humiliation, the former dynasty's imperial family all burned themselves to death on the day the city fell. Ever since then, the secret of the Tomb of the White King has been buried."
"It was not until recently that Xie Yi finally discovered the location of the Tomb of the White King."
"The Yin-Yang Five Elements Formation requires a massive amount of Death Qi. Because Wencheng was once a battlefield, the White King had the conditions necessary to set up the formation."
Chapter 118