Genshin Impact.

After encountering many obstacles on their way to immortality, Lin Feng and Li'er were not discouraged, but became more determined to explore the truth. And the mysterious old man has been silently paying attention to their every move.

Lin Feng, Li Er and the old man stopped in a foggy valley. The fog was so thick that people couldn't see the road ahead, as if the whole world was swallowed by the mysterious fog.

"This fog is very strange. I'm afraid there are unknown dangers hidden in it." The old man frowned, and the staff in his hand flickered with a faint light.

Lin Feng's eyes were firm, and the immortal sword in his hand flashed with cold light: "No matter what danger there is, we must break through and find the root of the confusion on the immortal path."

Li'er nodded, with courage shining in her eyes: "Well, we can do it."

The three of them stepped carefully into the mist, each step full of caution. Suddenly, a gust of wind whistled past, and the mist began to surge, transforming into various hideous shapes.

"Be careful!" the old man shouted, and waved the staff in his hand. A ray of light shot out and repelled the mist monster that pounced on them.

Lin Feng waved his sword, and the sword energy spread out, dispelling some of the surrounding fog. Li Er cast a spell to cast a protective barrier for the three of them.

With their joint efforts, they temporarily resisted the attack of the fog. However, as they went deeper, the monsters in the fog became stronger and stronger, and the attacks became more frequent.

"This is not a solution. We must find the source of the fog before we can completely solve the problem." Lin Feng said.

The old man pondered for a moment, then pointed to the depths of the valley: "I feel the source is in that direction, let's speed up."

They rushed into the depths of the valley under pressure. Along the way, they encountered various powerful monsters and traps, but they resolved them one by one with their tenacious will and superb magic.

Finally, they came to a huge cave. Thick fog continued to pour out of the cave. Obviously, this was the source of the fog.

Lin Feng walked into the cave without hesitation, and Li'er and the old man followed closely behind. The cave was filled with an evil aura, and strange lights flickered on the walls.

"There must be something controlling all this." Li'er said softly.

At this moment, a huge figure emerged from the darkness. It was a huge monster, emitting a powerful aura.

"So it's you who's causing trouble!" Lin Feng shouted angrily and rushed towards the monster with his sword.

The old man and Li'er also used their own magic to join the battle. The monsters were powerful and they fought fiercely with them.

Lin Feng's sword left wounds on the monster's body, but the monster's recovery ability was very strong, and the wounds healed instantly. Li'er's magic kept attacking the monster's weaknesses, but the monster always managed to dodge cleverly.

The old man performed a powerful forbidden technique to try to seal the power of the monster. With the close cooperation of the three, the monster gradually lost the upper hand.

Finally, Lin Feng found the right time and stabbed the monster's heart with a sword. The monster screamed and its body turned into a cloud of smoke and disappeared.

As the monster disappeared, the fog in the valley gradually dissipated and the sun shone on the earth again.

"Finally this problem has been solved." Lin Feng breathed a sigh of relief and wiped the sweat from his forehead.

Lier smiled and said, "Thanks to our concerted efforts."

The old man nodded: "This experience has also given us a deeper understanding of the immortal path. However, this may only be the beginning, and there are more challenges waiting for us in the future."

The three of them smiled at each other and continued on their journey to immortality. They knew that the road ahead was still long, but as long as they worked together, nothing could stop them from moving forward.