National Teacher Bu Tian replied, "Human-shaped source treasures are very difficult to interpret. They aren't true source treasures; rather, they use Source Stone Cultivation to transform themselves into source treasures, so they can't be interpreted through normal methods. They must rely on a Reverse Source Formation. However, setting up a Reverse Source Formation is equally complicated. Adjustments must be made according to the stars, the time, the direction, the qi and blood at the time, and so on. Over all these years, I've had two chances to set up a Reverse Source Formation, but both were delayed for various reasons."
National Teacher Bu Tian's explanation was fairly reasonable. Lu Yin took out the Wireless Gu and asked Lu Buzheng, in front of National Teacher Bu Tian, whether he had heard of Source Stone Cultivation. Lu Buzheng's answer was yes, and his explanation was more or less the same as National Teacher Bu Tian's, except that he didn't mention the Reverse Source Formation.
"Only a handful of experts at the Progenitor realm know that the Reverse Source Formation exists. The person who created Source Stone Cultivation was an expert at the Progenitor realm, and only an expert at the Progenitor realm could kill him. I obtained it by chance. The only things other people know are Source Stone Cultivation and that something bad will happen once it's cultivated, but no one knows what exactly that is," National Teacher Bu Tian explained.
With National Teacher Bu Tian's wisdom, even if this was a lie, it wouldn't be easy to expose him.
Lu Yin didn't believe him, but he couldn't find any flaws. "Let me see the Reverse Source Formation."
National Teacher Bu Tian engraved the Reverse Source Formation inside a Jade Stone and handed it to Lu Yin. After Lu Yin returned,