章 658: Difficulty in resolving the issues, Hei Lou Lan appears

In the underground cave, the light of wisdom flickered back and forth from bright to dim.

Fang Yuan quietly stood inside it. Only when the wills inside his mind were fully consumed did he open his eyes and step out of the wisdom light halo.

The deduction he made had succeeded, but Fang Yuan was gloomy because of it.

"To seal Spring Autumn Cicada, as much as over six thousand mortal Gu are required, among them, almost half are rank five, with rare Gu worms reaching two thousand, and there are also about eight hundred ancient Gu worms. These ancient Gu worms are either extinct or on the brink of extinction. My initial estimate is that I require about twenty-three immortal essence stones to use this method."

Fang Yuan was in a poverty stricken state, twenty-three immortal essence stones were a hopeless number for him currently.

But Fang Yuan had to brace himself to accomplish this task.