Lin Feng and Lin Fen walked deeper into the cave. They walked for three hours in a row, but they still did not see the end.
The surrounding environment was already pitch-black. In fact, Lin Feng even used the flames of the Firestorm to illuminate it. The flames could only travel about two to three meters at most, as if the surrounding darkness could devour light, making people feel fear.
Fortunately, Lin Feng and Lin Fen's mental strength was extremely powerful. Although they could not see, they could still sense the nearby situation. Therefore, Lin Feng could not be bothered to use the flames to illuminate.
The entire cave was extremely empty. In their perception, the cave was at least 1000 feet tall and more than 2,000 feet wide.