The Hidden Moth Gauze is an incredibly magical treasure; wearing it allows one to disguise themselves as nearly anyone. The closer one's physique and understanding to the target, the more effective the disguise.
What's even more magical is that the Hidden Moth Gauze's spell is a one-time casting with long-term stabilization, colloquially known as "put it on and don't worry about it," meaning once the disguise is complete, there's no need to focus on controlling the artifact.
Even a master like Hu Weidong, while able to sense that the "Hidden Moth" is not showing its true form, couldn't see through He Kao's disguise. Thus, the Hidden Moth Gauze became the treasure He Kao relied on and used the most.
However, there are known items in the world that can see through the Hidden Moth Gauze's disguise. The first is the Demon-Revealing Mirror inside the ancestral hall at the Phoenix Tail Town; the other, more powerful item is the Bone-Penetrating Treasure Mirror.
