Buzz...
A strange sound suddenly rang out, permeating the entirety of Nether Mountain.
Red Leaf Granny's face was pale as she tremblingly withdrew her hand.
"It's broken!"
Beyond the relief in her words, there was also a trace of joy.
For in her hand was an insect Gu resembling a turtle's shell.
It was precisely the fourth-order top-grade Gu insect, the Ten Thousand Arrays Gu!
This type of Gu insect was not born naturally, but refined artificially after the fact.
Using formation-related Gu insects as the foundation, supplemented by the Great Demon Evolution Dharma Turtle, and inscribing the Seven Fundamental Restrictions of Formation Dao, it could only take shape after years of nurturing.
With this Gu, eighty or ninety percent of the formations under heaven could be swiftly laid out.
More than that, it was even said that formation Dao strong experts could use this Gu to comprehend formation-related Law True Intent, thereby stepping into the Spirit Transformation realm.
Red Leaf Granny had come here specifically for this Ten Thousand Arrays Gu.
Li Tian Shi looked at the turtle shell in her hand, greed flashing through his eyes, though his words remained full of praise.
"Even the formation left behind by a great power has been broken by you. Hong Ye, your attainments in Formation Dao must have reached the pinnacle."
Red Leaf Granny shook her head. "It is not that this old woman is so capable. It is merely that Yin-Yang Child did not make too many arrangements before his death. After all, who would set formations everywhere within their own cave abode?"
That was indeed true.
The Yin-Yang Realm differed from the Primordial Era secret realms in the usual sense.
Those secret realms were often places where cultivators had suffered misfortune outside. To keep enemies from entering, they