Later, the Medical School of the human race conducted detailed research into the ambergris produced by whale demons and used it to develop many substances with wondrous effects, such as Aperture-Opening Incense, Guts-Protecting Sachets, Blood-Invigorating Spirit Salve, and more.
However, ambergris was unsuitable for pregnant human women, because accelerated blood circulation could cause miscarriages. The demon race had robust bodies and did not care about this side effect.
Ambergris products were essential for young children of the Sage Aristocratic Clans. Many children grew up in rooms where Aperture-Opening Incense burned from the moment they were born, and its use only stopped when they turned eighteen.
Wearing a Guts-Protecting Sachet could stabilize the Literary Palace and Literary Guts, with tremendous benefits accumulating over the years. The human Medical School had already conducted experiments on people of equal aptitude at various Literary Ranks. After twenty years, those with Guts-Protecting Sachets did not necessarily attain higher realms of Literary Guts, but their Literary Guts were sturdier, their Literary Qi more condensed, and even the growth of their Literary Palaces had an advantage.
After whale demons attained Saint Enfeoffment, they very rarely produced ambergris, so sacred dragon ambergris was exceedingly rare.
Generally speaking, once humans reached sixteen, the effects of Aperture-Opening Incense weakened considerably. After twenty, it had almost no effect, because Aperture-Opening Incense only worked on humans who were still developing.
But Aperture-Opening Incense made with sacred dragon ambergris as its principal ingredient was called Sage Aperture-Opening Incense, and it remained effective throughout a person's life!
Ordinary Aperture-Opening Incense could only stimulate human potential, placing a ceiling on its actual effects. Sage Aperture-Opening Incense was different. As long as humans used it, their intelligence would continue to grow, no matter their age.
In a thousand years of human history, only Sage Kong's grandson,