C1298 Ice crystal skeleton
Although Tang Huan did not know why the white-clothed man had come down from the upper realms, nor when he had arrived at the lower realms, he was certain that he had arrived at the lower realms for a very, very long time. This could be seen from the name "Heavenly King's Ancient Cave".
Furthermore, the person who named the cave should know that he was a Heavenly King of the upper realm