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After several generations, the "Golden Seal Jade Box," rumored to have been lost to the outside world, was always in the hands of the Quan family.
The "Golden Seal Jade Box" consisted of five schools, which the Quan family distributed to five individuals to manage, forbidding them from sharing their knowledge outside, allowing only intra-family transmission. The five schools, the Five Families, were: Shan, Yi, Ming, Bo, Xiang, collectively known as the "Five Techniques of Metaphysics." The heritage of the Five Families all relied on the Quan clan.
Within the Quan clan, Zhan Zishu was known as the "Bo" master.
