Rise of the Otherworld.

Lin Yu held the mysterious letter tightly, his eyes full of entanglement and contemplation. The paper of the letter wrinkled slightly in his hands, as if carrying a heavy weight. Everyone gathered around him, eager to know the contents of the letter. Their eyes were full of anticipation and anxiety, and the atmosphere was so tense that it was almost impossible to breathe.

"Master, what exactly did the letter say?" Tang Feng couldn't help but ask. His voice broke the brief silence, but it made the tense atmosphere even more solemn.

Lin Yu took a deep breath and said slowly: "This letter was written by a mysterious man who claimed to know the mastermind behind the scenes. He is willing to help us through this crisis, but we have to agree to one condition." His voice was low and suppressed, as if every word was filled with endless worry.

"What are the conditions?" the magician asked eagerly. Her eyes were filled with curiosity and nervousness, and her hands unconsciously clenched the corners of her clothes.

Lin Yu shook his head: "The letter didn't mention it, it just said that he wanted to discuss it with me in person." His brows frowned even tighter, and the worry on his face became deeper.

Everyone looked at each other, their hearts filled with doubt. Worry and uneasiness spread among them, like an invisible haze enveloping everyone.

"Master, could this be a trap?" the burly man, skilled in boxing, frowned. His thick eyebrows knitted together, and a vigilant glint flickered in his eyes.

Zhao Yu also echoed: "Yes, Sect Master, this matter is too strange, we have to be on guard." There was a hint of hesitation in his voice, and his eyes wandered between Lin Yu and the others.

Lin Yu was silent for a moment and said, "But our current situation is difficult. If this mysterious person can really help us resolve the crisis, it may be worth a try." His eyes were firm and resolute, as if he was ready to take the risk.

"But, what if..." Tang Feng hesitated. His face was filled with worry, and the uneasiness in his heart prevented him from saying the rest of the words.

Lin Yu raised his hand to interrupt him: "I know everyone's concerns, but we have no choice. I decided to meet with this mysterious man and find out his true strength." His voice was decisive and resolute, leaving no room for doubt.

Although everyone was still uneasy, they also knew that this was their only hope at the moment. They looked at Lin Yu silently, their eyes full of trust and expectation.

Lin Yu followed the agreement in the letter and arrived at a remote valley. The valley was filled with thick fog. The white fog was like a heavy curtain, making it difficult to see the road ahead. The cold wind blew through the valley, making a humming sound, like the whisper of a ghost.

"Is anyone there?" Lin Yu shouted loudly. His voice echoed in the valley, but was quickly swallowed by the thick fog, making him look particularly small and helpless.

A dark figure slowly emerged from the thick fog, his face indistinct. His figure loomed in the mist, emitting a mysterious and dangerous aura.

"Are you Lin Yu?" The shadow's voice was hoarse and low, as if it came from the depths of hell, making people shudder.

Lin Yu looked at the other party warily: "That's right, you are the mysterious man?" His hand unconsciously touched the sword at his waist, his body tense, ready to deal with possible danger at any time.

The black shadow sneered: "Yes, I can help you, but the condition is that the Zhenwang Sect must become my vassal." His tone was full of arrogance and arrogance.

Lin Yu's heart was shocked, and anger surged in his heart: "This is impossible!" His voice was firm and powerful, and his eyes were burning with anger.

The black shadow seemed to have anticipated his reaction: "Don't rush to refuse. Think about the current situation of the Zhenwang Sect. No one can save you except me." There was a hint of threat and temptation in his voice.

Lin Yu gritted his teeth and said: "Even if the Zhenwang Sect is destroyed, I will never be a vassal of others!" His eyes were firm, and he looked at the black shadow without flinching.

The black shadow was silent for a moment: "Then I will give you another choice. Help me obtain a treasure, and I will help you resolve this crisis." His tone softened a little, but still full of mystery.

Lin Yu asked, "What treasure?" His heart was full of doubts and vigilance.

The black shadow came close to Lin Yu and whispered the name of the treasure.

Lin Yu's face changed drastically. This treasure was extremely difficult to find and was fraught with danger. It was said that the place where the treasure was located had countless powerful guardian beasts and complex traps.

Lin Yu fell into deep thought. Would the True King Sect agree to the mysterious man's conditions? What should he do? Should he risk his life in search of the treasure, or refuse the mysterious man's help and continue to face the crisis alone?