C207 Biphasic Fusion(part I)

An Yifeng nodded and said, "I have a way to raise the grade of the formation to rank 5, but it will take some time and high grade spirit stones."

Upon hearing An Yifeng's words, a glint of light flashed across the Spirit Cultivator's eyes. Without a word, he threw him a Qiankun bag and said, "There are a hundred high grade spirit stones in here. That is enough for your formation