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Mark carefully pushed aside the thick white fog in front of him, as if he was pushing aside layers of heavy cotton wool. The white fog was cold and damp, with a biting chill, which stained his skin and made him shiver.

He walked slowly and firmly into the depths of the valley, and every step seemed to be extremely cautious, as if there was some danger hidden under his feet. Albert followed closely behind him, and he took out a crystal stone the size of an egg from his pocket. The crystal stone was transparent, and a silver halo flowed inside, as dazzling as a galaxy. He held the crystal stone tightly in his hand, his palms sweating slightly, and he watched the surrounding environment nervously. The valley was silent, with only the rustling sound of the wind blowing through the treetops and the rustling sound of them stepping on the fallen leaves, which seemed particularly clear in the silent valley.

A vague black shadow suddenly appeared in the thick fog, with an extremely fast speed, like a black lightning, accompanied by a low roar, and rushed straight towards Mark. The roar was deep and rich, with a beast's ferocity, which made people's eardrums buzz. The sudden attack made Albert scream, subconsciously took a step back, and almost fell to the ground. He quickly stabilized his body and watched the scene in front of him nervously.

Mark reacted quickly, dodged the attack of the shadow by side. The shadow brushed the corner of his clothes, bringing a gust of wind, making him feel a chill. He backhanded a knife, and the blue knife light cut through the thick fog, like a flash of lightning, illuminating a small area around.

"Awoo!" The shadow screamed and staggered back, revealing a monster figure resembling a wild wolf. This monster was huge, twice as big as an ordinary wild wolf, covered with black hair, which stood up like steel needles and flashed with a metallic luster. Its eyes were as red as blood, emitting a bloodthirsty light, and its fangs were exposed in its mouth, dripping with fishy saliva.

Seeing this, Albert quickly raised the crystal stone above his head. The crystal stone emitted a dazzling white light, like a small sun, dispersing the surrounding fog. With the white light, Mark finally saw the appearance of the monster.

This monster looks like a wild wolf, but it is more ferocious and more hideous than a wild wolf. It has muscular muscles and is full of explosive power. Its claws are as sharp as knives, flashing with cold light, and can easily tear steel. Its eyes are as red as blood, emitting a bloodthirsty light, as if it wants to devour everything in front of it.

"It's the Shadow Wolf!" Albert exclaimed, with a hint of fear in his tone. "This kind of monster feeds on dark energy, is powerful, and is very cruel!"

Mark didn't speak and rushed up again. One person and one monster entangled together.

Although the monster is powerful and fast, Mark is flexible and has resolved the monster's attacks several times, leaving several deep wounds on the monster. The blue blade light collided with the black demonic energy, making a series of piercing sounds, like the friction of metal.

The monster felt pain, let out a shrill howl, and turned to flee into the thick fog. The thick fog rolled, like boiling water, swallowing the monster's figure.

Mark did not chase, he looked around vigilantly, and the hand knife in his palm still emitted a faint blue light.

"We have to be careful," Mark said to Albert in a serious tone, "There may be other monsters in this valley." His eyes swept around, trying to find any clues.

Albert nodded, and he held the crystal stone tighter. The light emitted by the crystal stone illuminated a small area around, dispelling the thick fog and bringing a sense of security.

Mark looked around and found a cave in the valley. The entrance of the cave was covered by dense vines, almost integrated with the surrounding environment. If you don't observe carefully, it is difficult to find.

"There's a cave there," Mark pointed in the direction of the cave and said to Albert, "Let's go and have a look."

He walked quickly to the front of the cave and pulled away the vines covering the entrance. The vines were stained with dew, dripping on his hands, bringing a cool touch.

"Go in and have a look." Mark said to Albert and walked into the cave first.

Albert followed closely behind him, and he raised the crystal stone. The light emitted by the crystal stone illuminated the scene in the cave. The cave was damp and dark, and there was a musty smell in the air, which made people feel a little uncomfortable.

Albert followed behind Mark, and the light of the crystal stone illuminated the narrow cave entrance. The cave entrance could only accommodate one person. After Mark entered sideways, Albert was able to enter. He bent slightly and stepped carefully over the gravel at the entrance of the cave.

"Watch your feet," Mark turned back and reminded, his voice echoing in the cave with a hint of echo.

"Got it." Albert responded, frowning slightly, the musty smell in the cave made him feel a little uncomfortable. He subconsciously covered his nose with his hand.

Mark continued to walk forward, and the cave gradually became wider. The light of the crystal stone could also illuminate a larger area. The walls of the cave were covered with moss and were wet. The ground was also covered with a thin layer of mud, which was a bit slippery when stepped on. The surroundings were silent, and only the footsteps of the two of them echoed in the cave.

"This place... feels wrong." Albert whispered, looking around with a hint of uneasiness in his eyes.

Mark stopped, crossed the dagger across his chest, and observed the surrounding environment vigilantly. "Indeed, it's too quiet." He responded in a low voice, frowning. He reached out and touched the wall of the cave. The wall was cold and damp, which made him feel a little chilly.

A slight "rustling" sound came from the depths of the cave, breaking the silence of the cave. Mark and Albert turned their heads at the same time to look in the direction of the sound and tightened their weapons.

"What sound?" Albert asked in a low voice, with a hint of tension in his voice.

Mark did not answer. His eyes flashed with vigilance in the darkness, and his ears trembled slightly, capturing every subtle sound deep in the cave. He knew that the sound might be made by the monster lurking in the cave, or it might be something else. He must remain vigilant and be ready to deal with possible dangers at any time.

The atmosphere in the cave became more tense, and the breathing of the two became rapid. They knew that they might be in an unknown danger, and every step might be a life-and-death decision.