According to the Demon Refining Jug, it doesn't know much about Feng Yucheng either.

Originally, the Demon Refining Jug was sealed by the Demon Clan at the bottom of a lake called "Ten Thousand Demons Lake" within the Great Wilderness.

This jug is an immortal weapon crafted by ancient powerful beings specifically to combat the Demon Clan, much like your Most Stern Father of Foreign Race trait, targeting specific groups.

The Demon Refining Jug has ninety-nine ways to kill a demon.