Potions can't be sold.
The remaining options are cultivation techniques and formations. However, cultivation techniques depend on the heart of Dao and formations are too high-end - they are mostly purchased by large companies as a whole set.
As for magical artifacts, he doesn't have enough starting capital.
So, what was left was "Talisman".
The Taoist sect's development of talismans has reached perfection and were applied to all aspects of society. Many people within Taoist sects prefer to focus solely on their cultivation and are not interested in learning minor life spells like the Cleaning Technique or Disease Dispellin Technique.
Therefore, they use talismans, which are solidified spell.
The greatest profit of the talisman factory where Chen Mobai's mother works from is "Flying Talisman".
Flying is the dream of every human being, but Qi practitioners can't cultivate flying techniques, which makes the Flying Talisman the best-selling product.
