There's always a second when there's a first.
Following the Wolf Demons' success, many impoverished members of the Demon clan began selling "external belongings" such as fur and feathers. Eventually, it reached the point where some Spirit Beasts wanted to sell their Spirit Blood, but were resolutely rejected by the Wang family members.
"Collecting Spirit Wood Materials." Wang family members put up a new sign, which read, "We accept all types of Spirit Wood Materials—even trimmed-off dead branches and fallen leaves."
What is most abundant in the Ten Thousand Demon Kingdom? Naturally, it's the endless mountains filled with Spirit Wood, countless of which have developed sentience, including some as high as Level Seven, Eight, or even Nine.
