Nine Heavens Star was rich in land resources and had an enormous mortal population numbering in the billions.
Even this was despite the mortals on Nine Heavens Star living in a primitive state of slash-and-burn agriculture, with limited productivity.
If they developed people's livelihoods and increased productivity through immortal technology, as the Great Flame Dynasty did, the population could grow at least tenfold.
After the cultivators of the Five Hidden Families invaded Nine Heavens Star, they began gathering mortal blood essence and souls everywhere.
However, they did not drain the pond to catch every fish.
They left some seeds of life in every city, allowing the mortals to multiply and thrive, continuing to provide them with more blood essence and souls.
To Lin Fei, such conduct was nothing short of demonic.
Refining a single Heaven-Mending Immortal Pill required the blood essence and souls of over a hundred million mortals.
All that merely to raise a single human immortal.
Lin Fei even suspected that some human immortals would practice this art, attempting to use it to break through to the earth immortal realm.
But the amount of mortal blood essence and souls required would likely be horrifying.
It might take more than ten billion lives.
As for breaking through to become a celestial immortal, the number of mortal blood essences and souls required was even harder to imagine.
I can't let the Five Hidden Families carry on like this, or all of Nine Heavens Star will become a living hell.
If the Five Great Families really manage to raise human immortals of their own and take firm root on Nine Heavens Star, uprooting them will be all but impossible.
I must destroy them while their foothold is still unsteady!
Lin Fei's spirit body extended his spiritual sense, enveloping an area thousands