C3795 The Battle of Immortals and Demons

In Gu Fei's inner world, Gu Fei had given Yan'er a jade box and the jade box that the jade box was holding was a black colored pill. Even as a master alchemist, Yan'er was unable to tell what was so special about this black core.

Yan'er knew that Gu Fei was not an ordinary person. He had already become a member of the Sovereign of Extreme Dao