“It really is a spirit stone mine.” Next, Chen Feng pasted three Invisibility Talismans on his body. Only then did he possessed the courage to move forward, albeit slowly.

Chen Feng noticed that there was a circular, black pit with a radius of 100 zhang on the ground. It was unknown just how deep it was. Thick streams of demonic energy surged out from the pit and various demonic beasts would go in and out of the pit all the time. There were also row after row of humanoid demons standing guard around the pit.

Chen Feng carefully observed it all from 100 metres away. Not long after that, a row of demonic beasts came out from the pit while carrying square-shaped metal boxes.

Bang! Bang! Bang!

One by one, the metal boxes were thrown onto the ground. Chen Feng could see the demonic spirit stones within the metal boxes. They were gleaming with black-coloured light.

The demonic energy within demonic spirit stones seems thicker compared to the spiritual energy within Magic crystals. Chen Feng was somewhat shocked.

“Humph! Demonic energy is a type of spiritual energy.” Tower scoffed.

It did not take long for the metal boxes to pile up, becoming like a small mountain. By Chen Feng’s estimate, there was a total...