As for the exclusive purchase of trading one Energy Blood Essence for three Life Fruits, it's simply not worth it. Although the Life Fruit can be obtained using monster blood, the Life Tree has a daily limit on the number of Life Fruits it can produce, with a maximum of thirty per day.
These Life Fruits are not only greatly beneficial to him but also to the local disciples of the Black Obsidian Martial Arts Hall; thirty per day is barely enough for their use, let alone for trading with the Celestial River Domain City.
Moreover, the annual production of Energy Blood Essence in the Celestial River Domain City is limited. Even if he is willing to sell to the Celestial River Domain City, how much Energy Blood Essence can the city afford to buy?
Spending a dozen or so Energy Blood Essences a year might be the upper limit, but for the vast Black Obsidian Martial Arts Hall, it's just a drop in the bucket; it's not even enough for him alone.
