The Tapir Demon clan struggled to reproduce; from a young age, each Tapir Demon was taught that ensuring the continuation of the clan was the main mission in life. And so, the Sixth Great Realm manipulated the demon's eggs to reawaken an almost lost evil demon technique:
Refined Human Oil!
Fresh and lively humans, the happier, the better, were trapped in illusions, experiencing the most miserable pain—only pain could give more power!
Their bodies were then melted, forcing all their strength and essence into their souls.
Next, their souls were tortured using nine punishmentsas horrific as those of hell, further strengthening the power of "pain" within the soul.
The final step involved crushing the soul, akin to extracting oil!
The soul was destroyed, leaving behind a single drop of "human oil"!