916 Ninth Level Void Interpretation! 5yr

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"Age restriction? How does that work?" Huang Daniu was puzzled.
"You must have heard of the Age Measuring Pearl right? As long as an Inscription Formation is made using the Age Measuring Pearl as the ingredient, coupled with a few other Inscriptions, it can easily set the age restriction to a certain age group and restrict them from passing through the gate that's shrouded by the Inscription Formation," Duan Ling Tian explained patiently.
"Oh, so that's how it is." Huang Daniu suddenly saw the picture much more clearly. At the same time, he asked curiously, "Then, in this case, the secret treasure that the Martial Emperor left behind has such a restriction set by the Inscription Formation?"
"Yes," Duan Ling Tian nodded his head.
"What's the age limit?" Huang Daniu asked inquisitively.
Forty years old," Duan Ling Tian replied.
"Forty years old? So, that's to say only the younger martial artists can enter this place… Ah, no wonder!" Huang Daniu finally understood.
As he recalled D