It is estimated to be ordinary research, delved into for many years, and possibly left for successors or heirs, which is why such detailed descriptions were made.
A cultivation technique combining incredibly powerful body refining rune seeds, once mastered, can withstand same-realm cultivators with its sheer defensive power alone, making it extremely formidable.
Unfortunately, the bearded man was too greedy, chose the wrong target and mistook Zheng Yi for an easy mark, and later wanted to kill him to silence him, only to hit an iron wall.
It just so happened that Zheng Yi was preparing to deal with Yi Qing Zi and had his contingencies in place, but in the end, he didn't manage to deal with Yi Qing Zi; instead, the bearded man walked right into the trap and met his unfortunate end, which can only be considered his bad luck.
Now his body, along with several Foundation Establishment Stage tribulation cultivators, are buried under the Blood and Flesh Gourd, becoming fertilizer.
