Chương 637: Chapter 637 Greedy Steward_1

"What's that?"

Suddenly, Ling Xiao saw a strange ship completely enveloped in a metallic shell, which was so tight that not even water could penetrate.

"That's called a submarine, which only Elders and those at the Demon General level are qualified to ride in,"

Tu Yan explained, "Submarines usually search for secret treasures on the seabed. This sea area is rumored to have the cultivation cave mansion left by the King of People, but unfortunately, despite years of searching, no results have been found."

"Human King's Cave Mansion!"

Ling Xiao felt a jolt in his heart upon hearing these four words.

No matter what Martial Arts he practiced or what legacy he inherited, the Mountain and River Martial Soul was always the core, so he was eager to enhance its level as soon as possible.

In his lifetime, the King of People had changed many places of cultivation, leaving numerous cave mansions, any of which might contain something related to the Mountain and River Martial Soul.