The Yellow Dragon Tribe was indeed related to the immortal palace.

When Li Mu heard what the chief of the Yellow Dragon Tribe said, he knew the judgment that he made in the Mount Shong World was correct. According to the secret history book of the Mind-clearing Sword Sect, the ancestor of the Yellow Dragon Tribe used to be the divine beast guarding the gate of the immortal palace. He had asked the chief of the Yellow Dragon Tribe about that before, but the latter had ...