There are many things that outsiders simply do not understand.
It's just like how Lu Xuanji perceives the Feiyu World, the Undead Clan, and the Eight Great Saint Races, which might be vastly different from reality.
These specific pieces of information, detailed and truthful intelligence, are what he lacks.
And also the information he cannot access.
Jiao Yu'Er listened, without any extra doubts, and said: "The Undead Clan was once just a branch of the Feather Demon Race. But a million years ago, or perhaps even longer, an existence directly proved the Dao and became an Immortal. After becoming Immortal, he did not ascend to the Immortal Realm but remained in the Human World."
"Gradually refining myriad techniques, his realm constantly increased, its exact strength unknown to the world."
