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Mark moved slowly, blocking Albert behind him. Slowly, he approached the source of the sound, taking every step extremely cautiously, as if he was stepping on thin ice. The air in the cave was damp and cold, with a strong musty smell, making people feel a little uncomfortable to breathe.

Albert held his breath and raised the crystal stone, letting the light shine as deep as possible. Although the light emitted by the crystal stone was weak, it was enough to illuminate a small area around and dispel some of the darkness. He clenched the dagger, his palms sweating slightly, and stared nervously ahead, his eyes full of vigilance. The walls of the cave were covered with wet moss, and under the light of the crystal stone, they showed a strange dark green, like a ghost lurking in the dark. Water droplets slowly dripped along the moss, forming small puddles on the ground, making a crisp ticking sound, which was particularly clear in the silent cave.

The "rustling" sound rang out again, accompanied by the sound of flapping wings, becoming clearer and more rapid, as if something was flying towards them quickly.

A huge bat suddenly flew out of the darkness, making a shrill scream, like a sharp metal friction sound, which made people feel creepy. This bat was extremely large, and its spread wings almost covered the entire cave passage, casting a huge shadow, making people feel a suffocating sense of oppression. Its fur was dark red, like dried blood, and it flashed a strange luster under the light of the crystal stone. Its mouth was full of sharp fangs, jagged like saw teeth, reflecting cold light in the dim light, which made people shudder.

The giant bat screamed and swooped down, and the smelly wind blew in his face. Albert could even feel the airflow brought by the flapping of the giant bat's wings.

In a flash, Mark quickly shot out a beam of energy, and the dark blue energy cut through the darkness, like a flash of lightning, and shot straight at the swooping giant bat.

The bat was hit and let out a shrill whine. Its huge body rolled several times in the air and fell heavily to the ground, raising a cloud of dust. It struggled for a few times and then stopped moving. Dark red blood flowed out of the wound and spread on the ground, emitting a pungent smell of blood.

Albert immediately stepped forward. He squatted down and carefully fiddled with the bat's body. He found that it was even bigger than expected. Its mouth was full of sharp fangs, like a sharp dagger, which was shocking. The bat's wings were badly damaged, revealing the white bones inside, which looked particularly hideous under the light of the crystal stone.

Mark looked around and saw a fork in the road deep in the cave. The two roads led to different directions, like two greedy giant mouths, waiting for prey to fall into the trap. He signaled Albert to stay alert, and he took the lead to walk to the road on the left. The road on the left was narrower, only enough for one person to pass through. The rock walls on both sides of the road were covered with sharp stone spikes, like sharp blades, reflecting cold light under the light of the crystal stone.

Mark walked lightly along the road on the left, and his figure gradually disappeared into the darkness. Albert took a deep breath and followed Mark. The light of the crystal stone illuminated his way forward and the solemn expression on his face.

Mark took every step very carefully. He could feel the sharp stone spikes on the rock wall on the left, almost sticking to his arm. He moved sideways, trying to avoid contact with the stone spikes, while listening carefully to the movements around him. The air was filled with a strong smell of blood and damp soil, which made him feel a little uncomfortable. He frowned slightly and quickened his pace.

Albert followed behind Mark. The light of the crystal stone could only illuminate a short distance ahead, and he almost moved forward against Mark's back.

"Be careful with your feet." Albert whispered to Mark in front of him, and at the same time held a protruding rock with his hand.

Mark nodded. With the light of the crystal stone, he saw some gravel and bat feathers scattered on the ground. He carefully avoided these obstacles and tried not to make any noise.

The road on the left was winding. After walking about 20 meters, the front suddenly opened up and a relatively spacious cave appeared. There was a bottomless pit in the center of the cave. Some strange plants grew around the pit, emitting faint fluorescence.

Albert stopped, raised the crystal stone, and carefully observed the surrounding environment. There were some strange symbols carved on the rock wall around the pit. Albert recognized that it belonged to one of the 12 tribes-the Valley Tribe.

"What is this place?" Mark walked to Albert and asked in a low voice.

Albert pointed to the symbols around the pit, "These symbols are from the Valley Tribe. The story is that after the Holy City was broken, they got a piece of the Holy Stone by chance, were hunted by Elvira, and the whole tribe fell here."

Mark looked in the direction of Albert's finger, and those symbols looked even more sad under the light of the crystal stone.

Suddenly, there was a "crackling" sound from the depths of the pit, as if something was crawling.

Mark and Albert immediately became alert and stared at the depths of the pit.

A huge spider crawled out of the pit. Its body was bigger than a millstone, and its eight long legs were covered with black hair. Against the backdrop of the fluorescent plants, it looked particularly terrifying. The spider's eyes emitted a red light, like two burning charcoal fires, which made people shudder.