The mysteries of sealing techniques lay in separation, suppression, balance, and endurance. Through the passage of time, the sealed object was gradually worn away and forgotten, until it returned to nothingness.
Although the Mithril Dust Seal sealing technique Reilo had mastered was considered quite advanced in the Academic World, any sealing technique developed to isolate and block the effects of Dark Essence was certainly no ordinary field of study. Still, compared with the many sealing techniques created by scholars, the Mithril Dust Seal technique probably didn't even rank among the best.
It was no wonder, then, that Reilo was eager to uncover the mysteries of the Nine Yins Sealing Technique.
"I have only one request."
After a long silence, the Nine Yins Rat Demon finally spoke.
In the eyes of the Nine Yins Rat Demon, this human from the surface was even more evil and terrifying than the Demon God who had once coveted this valley.
At least the Demon God had only sought to control the valley in order to enslave its inhabitants, expand his faith, and the like. He had no interest whatsoever in the so-called knowledge of the dark creatures.
To the Nine Yins Rat Demon, having someone demand its knowledge was an act of war—a blatant attempt to seize the fruits of its work. It might not lose anything in the process, but such things had only ever happened between dark creatures. Demon Gods were more practical: they only needed others to obey their will. Even when the Superhumans invaded the Underground World and laid waste to it, nothing like this had ever happened.
But now this surface-dweller was plundering its hard-won knowledge just like any other dark creature!
"Heh, go ahead."
Reilo spoke pleasantly.
He sounded as though they were old friends, not a powerful