Zhang Yu possessed the "Dao Seed Chart" for many years, with ample experience in replicating and upgrading Dao seeds.
According to his own summarized experience, the conditions for replicating and upgrading Dao seeds are often closely related to the specific function and type of the Dao seeds.
For instance, the "Deep Cold Magical Vein" requires an increase in total mana and mana quality, while "Heavenly Craftsmanship" requires designing a magic treasure together.
Given that the "Emperor's Command Nine Heavens" requires him to assist Tai Yue Bai in intimidating others, its specific ability, in Zhang Yu's view, likely relates to intimidation as well.
"Apart from that... there's also the level."
