Starting with the Immortal Cultivation System, what can you use to fight me?

"Om-"

A low humming sound echoed, and the totem on the stone door seemed to come alive, emitting a dazzling light. As the light gradually faded, the previously indestructible seal began to slowly dissipate, revealing a hidden passage behind the stone door.

"It's done!" Lin Han breathed a sigh of relief, a tired but satisfied smile on his face.

"Good boy, well done!" Tian Yunzi patted Lin Han on the shoulder and laughed, "It seems we have found a treasure on this expedition!"

Nangong Wanyue also smiled slightly, and her eyes looked at Lin Han with a little more tenderness and appreciation. Gu Xuanfeng nodded gently, indicating that everyone should continue forward.

The four of them stepped into the passage, and after a sudden twist in space, they emerged above a vast grassland. The sky was a brilliant blue, with a few white clouds drifting leisurely. It was a stark contrast to the dark and mysterious realm they had just encountered, as if they had stepped into a whole new world. Flowers bloomed above the grassland, butterflies fluttered, and in the distance, a series of mountains loomed, shrouded in mist and clouds. It was a breathtaking sight.

"Wow...it's so beautiful here!" Tian Yunzi looked around, his eyes full of disbelief. "Inside the secret realm, there's actually such a fairyland-like place?"

"Indeed, the spiritual energy here is several times denser than that outside. It seems that we are approaching the core area of ​​the secret realm." Nangong Wanyue said softly.

"Everyone, be careful. The more beautiful a place is, the greater the danger it often hides." Gu Xuanfeng reminded. Although his tone was calm, there was a hint of vigilance in his eyes.

Nangong Wanyue walked slowly in front of the group, her icy aura gently spreading around them, as if building an invisible protective net for everyone. Lin Han followed closely behind, his eyes scanning the surroundings sharply, not missing any unusual signs.

"The atmosphere here is completely different from before. The spiritual energy is so rich that it is almost liquefied. There must be something extraordinary here." Lin Han said in a low voice, secretly guessing the secret of this grassland in his heart.

Just as everyone was immersed in the beauty of the grassland, a melodious flute sound suddenly rang out, piercing the quiet air, melodious and mysterious. The sound of the flute seemed to strike directly into people's hearts, making people involuntarily intoxicated by it.

"Be careful, there's something strange about that flute!" Gu Xuanfeng suddenly shouted, unleashing a powerful spiritual force to try to ward off the intrusion of the flute. However, the flute sound seemed to possess some kind of magical power, and even a late-stage Tribulation Crossing expert like him felt a moment of trance.

"It's a Phantom Sound Beast!" Nangong Wanyue's expression changed slightly as she quickly identified the source of the flute sound. "They specialize in attacking with sonic waves, which can confuse people and even control their will."

Before he finished speaking, the air around him began to distort, and phantom sound beasts of various shapes emerged from the void. Some of them were in human form, some were in animal form, surrounded by colorful light, and their eyes were flashing with cunning light.

"Hmph, a mere Phantom Sound Beast, you dare to show off your skills in front of me!" Tian Yunzi snorted coldly, and with a flash of his body, he transformed into a stream of light and rushed towards the Phantom Sound Beasts. The dagger in his hand turned into thousands of sword shadows, sweeping towards them like a violent storm, and in an instant, several Phantom Sound Beasts were chopped into pieces.

However, these phantom sound beasts seemed endless. Every time one was destroyed, a new one would be born from the void. They surrounded the four people, constantly emitting melodious flute sounds, trying to confuse their minds.

"This is not a solution. We must find the true form of the Phantom Sound Beast to completely break their illusion." Lin Han said in a deep voice. He closed his eyes, trying to keep his mind clear, and at the same time released his perception, trying to find the truth hidden behind the illusion.

At this moment, he suddenly felt an extremely powerful spiritual power fluctuation coming from the depths of the grassland. The fluctuation contained an ancient and mysterious aura, which was completely different from the previous phantom sound beast.

"Found it!" Lin Han suddenly opened his eyes, a determined light flashing in his eyes, "The true form of the Phantom Sound Beast is right there!"

He pointed with his finger, and everyone looked in the direction he pointed. They saw an ancient altar slowly rising in the depths of the grassland. On the altar, a huge phantom sound beast was playing the flute with its eyes closed. The sound of the flute was the source of all illusions.

"Go!" Gu Xuanfeng shouted, and the four of them simultaneously transformed into streams of light and rushed towards the altar. They knew that only by defeating the giant phantom sound beast could they completely escape this endless illusionary attack.

"Humans, you have finally come to challenge the level. I have been getting a little impatient waiting!" The huge phantom sound beast opened its bright eyes on the altar. Although its voice was still melodious, it had a bit more provocative meaning.

"Are you the guardian spirit beast that the little tiger mentioned, in the late stage of tribulation?" Tian Yunzi looked up and down at the huge phantom sound beast, a playful smile on his face. "Hmph, judging by your appearance, you're nothing special!"

"What? You, an old fellow in the early stage of tribulation, are qualified to talk to me?" The Phantom Sound Beast King sneered, with a hint of disdain in his voice.

"You're in the late stage of tribulation, so what? Are you the highest late stage of tribulation?" Tian Yunzi was immediately unhappy when he heard this. He raised his beard and retorted.

"Hmph, old man, if you don't agree, you can come and challenge me. Don't talk to me here!" The Phantom Sound Beast King snorted disdainfully.

"You little bastard! Teach this monster a lesson for me!" Tian Yunzi flicked his sleeves and winked at Lin Han. The meaning was obvious - this job is left to you.

“Haha… him?” The Phantom Sound Beast King turned his gaze towards Lin Han, then looked him up and down before saying with disdain, “A kid in the Spiritual Transformation Stage, you think you’re qualified to teach me a lesson? Old man, you must have drunk too much fake wine and become stupid!”

Faced with the ridicule of the Phantom Sound Beast King, Lin Han did not get angry. Instead, a faint smile appeared on the corner of his mouth.

"The level of cultivation is not the only criterion for measuring strength." Lin Han spoke slowly. Although his voice was soft, it was filled with unquestionable firmness.

"Haha... According to what you said, can you defeat me with the strength of the Spirit Transformation Stage?" The laughter of the Phantom Sound Beast King echoed on the grassland, with a bit of arrogance and mockery.

"That's right..." Lin Han said calmly.

"Junior Brother Lin, did I hear you correctly? Are you sure you want to challenge the Phantom Sound Beast King who is in the late stage of Tribulation with your cultivation level of the Spirit Transformation Stage?" Nangong Wanyue was surprised, her beautiful eyes full of disbelief.

Gu Xuanfeng also frowned slightly, obviously surprised by Lin Han's decision.

"Master's aunt, Master's uncle, don't worry, I have my own way." Lin Han looked at the two of them with a smile, his eyes flashing with confidence.

"Haha... interesting, so interesting! You are courageous, boy, but being too arrogant is not a good thing." The Phantom Sound Beast King laughed, with a bit of teasing and anticipation in his voice, as if he really wanted to see how this kid in the God Transformation Stage could turn the world upside down.