Next to him, Zhang Yu looked at the Dao Seed Chart in the "Yu Shu," thinking to himself: "Bu Yingshu's [Ten Thousand Laws Immortal Clan] wanting to raise to Level 6 requires extracting ten Cultivation Techniques each from the Immortal Sect Techniques' True Transmission level, Strategic level, Town School level, and Heavenly Opening level."
In total, 40 Immortal Sect Techniques need to be refined, including 10 Town School and 10 Heavenly Opening techniques. To Zhang Yu, this is incredibly difficult and definitely not something that can be achieved in a short time, so he wasn't very motivated to continue working on this with Bu Yingshu.
Especially since... most Immortal Sect Techniques cannot be easily gifted, which means that even if Bu Yingshu has many Immortal Sect Techniques, she can't persuade Zhang Yu to research and refine them together without the copyrights.
