After leaving the Law Protection Hall, Chu Liang made his way to the Pill Furnace Hall. He seemed intent on touring all four halls in a day.
In the Pill Furnace Hall, aside from areas for selling elixirs and arranging for alchemy services, there was a special hall called the "Treasure Medicine Hall," where all sorts of heavenly materials and earthly treasures were listed.
Over the years, Shu Mountain's disciples would report any heavenly materials and earthly treasures they saw or learned about during their travels to the Pill Furnace Hall. That way, if someone needed such a material or treasure in the future, they might find clues here.
No rewards were given for providing such information, but, by convention, those who found a treasure based on the information were expected to thank the person who provided it.