As environments shift and change, living beings must always adapt and evolve.
Consequently, organs that are no longer needed will atrophy over generations.
In the last era, the Beastmaster civilization had its glory, but it was all buried in history.
Nearly eighty to ninety percent of Pet Beasts worldwide underwent devolution based on the principle of "use it or lose it."
It wasn't until sixty years ago, with the Spiritual Qi Revival, that Beastmasters and Pet Beasts returned to the public eye.
By this point, an entire epoch had passed since the last Beastmaster civilization.
This epoch doesn't refer to a century, but rather a Beastmaster epoch, dating back a distant ten thousand years.
As a result, most new-generation Pet Beasts no longer possess the organ characteristics of the ancient Beast Taming Era.
