The Immortal Physician's Transmigration: Miraculous Rejuvenation

Ye Yuanchen and the others stepped into the Spirit Realm once again. This land, which had once been ravaged by dark forces, had now recovered much of its vitality. However, they had no time to appreciate the beautiful scenery after its rebirth, as they were preoccupied with wondering where the mysterious "Key to the Spirit Realm" was.

"What will this Key to the Spirit Realm look like? And where in the Spirit Realm will it be hidden?" Mu Wanyue frowned, her eyes filled with doubt and worry.

Lu Zixuan calmly analyzed, "Judging from the clues in that letter, the Key to the Spirit Realm must be something with a deep connection to the Spirit Realm. It may be some kind of ancient spiritual object, or a divine artifact that has been sealed here for a long time. We need to look for clues in the historical relics and ancient legends of the Spirit Realm."

Ye Yuanchen nodded slightly and said, "Brother Lu is absolutely right. Then let's first explore the Spirit Clan's ancient library; perhaps we can find something there."

The group arrived at the Spirit Clan's ancient library. This ancient building exuded an old-fashioned atmosphere and was filled with rows of tall bookshelves piled high with all sorts of ancient books and scrolls, recording the history, culture, immortal techniques, and many unknown secrets of the Spirit Realm over thousands of years.

They began to meticulously examine these ancient texts, turning each page carefully, leaving no information unchecked that might be related to the Key to the Spirit Realm. Time passed quietly in the tranquil archives, and their eyes grew weary, but they persevered, for they knew that the Key to the Spirit Realm was crucial to the fate of the entire Three Realms.

Finally, in a dusty ancient book, Ye Yuanchen found a vague record: "The Key to the Spirit Realm is a treasure born in the Spirit Realm at the beginning of the world. It is shaped like crystal and contains the original power of the Spirit Realm. It is hidden on the top of the sacred mountain of the Spirit Realm and guarded by the guardians of the Spirit Realm. Only those with the right destiny can see it."

"The summit of the sacred mountain in the Spirit Realm? That's a clear direction. However, the guardian of the Spirit Realm must be quite powerful, so we need to be careful," Ye Yuanchen said, a hint of seriousness in his eyes.

They left the ancient library and headed towards the sacred mountain of the spirit realm. The sacred mountain soared into the clouds, its peaks shrouded in mist and filled with a mysterious aura. Along the way, they encountered some strange beasts from the spirit realm, but they easily repelled them all.

As they approached the summit of the sacred mountain, a powerful surge of spiritual energy washed over them. A colossal spirit bird appeared before them, its feathers shimmering with multicolored light, its eyes sharp and majestic—it was none other than the Spirit Feathered Divine Vulture, one of the guardians of the spirit realm.

"Who dares to trespass on the summit of the sacred mountain of the Spirit Realm?" The Spirit Feather Divine Vulture let out a sharp cry that echoed through the valley.

Ye Yuanchen stepped forward and said respectfully, "We have come to find the Key to the Spirit Realm, which concerns the safety of the Three Realms. We hope that Lord Divine Eagle will be lenient."

The Spirit Feather Divine Eagle lowered its head slightly, scrutinizing them: "The Key to the Spirit Realm is a sacred object of the Spirit Realm. How dare you take it at will? If you wish to obtain it, you must first pass my test."

"What kind of test will Lord Shenjiu set out?" Mu Wanyue asked.

The Spirit Feather Divine Eagle spread its enormous wings and said, "I will release the illusionary barrier of the spirit realm. You must endure within it for the time it takes for an incense stick to burn, and you must not lose your mind, in order to pass the test."

Having said that, the Spirit Feather Divine Eagle flapped its wings, and the surrounding space was instantly enveloped in a layer of multicolored mist. Ye Yuanchen and the others felt that the scene before them was constantly changing, one moment a fairyland full of blooming flowers, the next a hellish place strewn with corpses, various terrifying and beautiful scenes appearing alternately, trying to disturb their minds.

Ye Yuanchen immediately circulated his spiritual energy, closed his eyes, and, relying on his strong willpower and keen perception of spiritual energy fluctuations, silently maintained a sliver of clarity in his mind. Mu Wanyue wielded the Spirit Void Whip, its tip shimmering with pink light, dispelling the approaching illusions one by one. Lu Zixuan set up a small spiritual energy stabilization array on the spot to help everyone resist the interference of the illusionary illusion barrier. Bai Youruo played the Spirit Void Melody Flute, the flute's sound transforming into a gentle force that echoed in everyone's ears, soothing their hearts.

With everyone's concerted efforts, they finally managed to hold out for the duration of an incense stick burning. The illusion gradually dissipated, and the Spirit Feather Divine Eagle looked at them with a hint of approval in its eyes: "You have passed the test. It seems you truly care about the Three Realms. However, the Key to the Spirit Realm is not easily obtained. You still need to break the seal of the spirit array on the Holy Mountain before you can obtain it."

Everyone looked towards the summit of the sacred mountain, where complex spiritual runes flickered, forming a massive spiritual array seal. Lu Zixuan stepped forward and carefully studied the structure and rune arrangement of the spiritual array seal.

“This spirit array seal is extremely complex, incorporating many ancient array principles from the spirit world, but I think I can find a way to break it,” Lu Zixuan said confidently.

He took out various array-setting materials and magical artifacts from his storage treasure and began carefully breaking the spirit array seal. Ye Yuanchen, Mu Wanyue, and Bai Youruo stood guard beside him, watching out for any potential dangers.

Sweat gradually beaded on Lu Zixuan's forehead. His hands moved swiftly, placing the array materials one by one at the key points of the spirit array seal, while he chanted incantations and cast immortal spells to break the array. As time passed, the spirit array seal began to show signs of loosening.

Suddenly, the spirit array seal emitted a powerful counterattack beam of light, shooting towards Lu Zixuan. Ye Yuanchen reacted swiftly, unleashing the "Spirit Realm Chaos Suppressing God Technique" and using the Spirit Void Holy Sword to block the beam.

"Brother Lu, be careful!" Ye Yuanchen shouted.

Lu Zixuan wiped the sweat from his forehead and said, "It's alright, this is the dying struggle of the spirit array seal. I have found its core weakness, give me a little more time."

Under the tense gaze of everyone, Lu Zixuan finally succeeded in breaking the spirit array seal. As the seal was broken, a dazzling light shot out from the summit of the sacred mountain. Within the light, a crystal-clear crystal slowly rose, containing powerful spiritual energy—the very key to the spirit realm they had been searching for.

Ye Yuanchen cautiously reached out and grasped the Key to the Spirit Realm. The instant he held the Key, a powerful surge of information flooded his mind, seemingly guiding them to the entrance to that mysterious space.

"We've found the Key to the Spirit Realm and also know the location of the entrance to the mysterious space. Without further ado, let's set off now," Ye Yuanchen said.

Carrying the Key to the Spirit Realm, the group hurried towards the entrance to the mysterious space. They knew that unprecedented challenges and unknown dangers awaited them within that space, but they had no way back. To completely eliminate the source of darkness and save the Three Realms, they had no choice but to forge ahead.