I have changed my destiny and become an unparalleled immortal.

This man, whether cultivating his body or his magic, always manages to break the norms of the cultivation world and create miracles time and time again.

"Alright, I know you're powerful. Don't push yourself if your spiritual energy is overdrawn. Come back to your bedchamber with me and rest. I'll have the apothecary brew you a pot of Spirit Nourishing Soup."

Mo Qianyan, unusually, did not put on airs as a palace master. She naturally helped Gu Yun walk out of the hall.

"Thank you, Madam!"

Gu Yun obediently followed Mo Qianyan out, a triumphant smile on her lips.

However, from an angle that Mo Qianyan cannot see.

A dangerous glint flashed in Gu Yun's scarlet eyes.

"Damn it, fifty years of life! I've lost so much money this time!"

Gu Yun gritted her teeth and mentally calculated the cost of this.

"Although the Great Evolution Butterfly's predictive ability is incredibly powerful, it's a bottomless pit that drains one's lifespan! It should never be activated recklessly again unless absolutely necessary."

"However, since I've spent fifty years of my life learning all these underhanded tricks, how can I justify the lifespan I've lost by not going out and finding some fun?"

Gu Yun clenched his fist, and his dark bronze bones cracked.

But then he thought about it again. The smooth feeling of forming an array in the void just now, and the vast and integrated knowledge of the various arts of cultivation in his mind, made him feel an unprecedented sense of power.

"If I stop now, I'll have truly wasted these fifty years of my life. But what if I completely drain the resources of the Cold Moon Palace?"

Gu Yun licked his dry lips, a gambler's madness flashing in his eyes.

"If I lose my life, I can go kill demonic cultivators and slaughter old monsters, recouping my losses with interest! But this kind of divine insight, this chance to instantly grasp the essence of a sect's millennia-old heritage—if I miss it, I'll be punished by heaven!"

Having made up his mind, Gu Yun did not step out of the side hall. Instead, he took out the Palace Master privilege token that Mo Qianyan had given him and strode towards the fourth floor of the library!

The Cold Moon Palace Library has six floors.

The first to third layers are the foundation, while the fourth to sixth layers are the true core of the heritage!

High-level formations, top-grade pill formulas, lost talismans, and secret techniques and supernatural abilities with earth-shattering power.

Gu Yun stepped into the fourth floor and casually picked up a jade slip that emitted an ancient aura, a third-tier killing formation: the Profound Ice Sword Formation.

My divine sense has just probed in.

hum!

Within the Purple Mansion's sea of ​​consciousness, the blood-red butterfly that had fallen into hibernation flapped its wings once more, but this time, the speed at which the butterfly flapped its wings became noticeably heavier!

A line of dark golden characters representing the Heavenly Dao appeared:

[A third-order formation inheritance has been detected.]

[The Great Evolution Butterfly Transformation Deduction has begun. Estimated time: one day in the outside world, ten years in the divine soul.]

[Equivalent exchange, estimated lifespan deduction: 10 years!]

"hiss!"

Gu Yun gasped, then suddenly realized what was going on.

"So that's how it is! This damned Book of Fate doesn't calculate lifespan based on external time; it's directly linked to the level of knowledge acquired!"

"The more advanced, obscure, and profound the knowledge, the more it touches upon the core laws of Heaven, the longer the virtual time required for the divine soul to deduce it, and the more terrifying the lifespan deducted!"

A third-tier formation technique requires a ten-year lifespan?!

Gu Yun's hand holding the jade slip trembled slightly, but he suddenly gritted his teeth, his eyes flashing with a fierce light.

"Ten years it is! You can't catch a wolf without risking your cub. Even if I have to risk my life today, I'll fleece the Cold Moon Palace until they're bald!"

"Divide it for me!"

boom!

Gu Yun sat down cross-legged, and his divine sense surged into the jade slip like a tsunami.

For the next two weeks, the upper echelons of the Cold Moon Palace Library became a chaotic battlefield where lifespans were devoured!

Gu Yun was like a tireless madman, his eyes bloodshot, frantically scanning between the fourth, fifth, and sixth floors!

Third-tier supreme-grade pill formula: Derivation of the Nine Revolutions Golden Elixir of Creation! (Deducts fifteen years of lifespan!)

Ancient Talismanic Fragment: Derivation of the Shrinking Earth to an Inch Divine Travel Talisman! (Deducts twenty years of lifespan!)

Secret Technique of the Cold Moon Palace: Deduction of the Taiyin Cold Domain! (Deducts thirty years of lifespan!)

Analysis and deduction of the core of the sect-protecting formation! Forty years of lifespan will be deducted!

One book after another! Volume after volume!

Gu Yun's mind seemed to have turned into an overloaded computer.

Countless top-secret pieces of knowledge that would cause bloodshed in the outside world were forcibly dismantled, crushed, and imprinted into the depths of his soul by Red Butterfly in an extremely tyrannical manner!

half a month later.

The highest point of the sixth floor of the library.

"Clatter".

Gu Yun tossed the last scroll, representing the Xuanbing Divine Iron Forging Method—the highest level of weapon crafting in the Cold Moon Palace—back onto the jade shelf.

He looked as if he had been pulled out of the water, his whole body soaked in cold sweat.

That once powerful and savage body, with its dragon-like blood and energy, was now slightly hunched over, and its once strangely handsome face now showed a deep, deathly grayness of depleted spirit.

He succeeded.

With the help of the Book of Destiny's Great Evolution and Butterfly Transformation, he alone, in just over twenty days, completely devoured all the cultivation arts, techniques, and secret arts accumulated by the ancestors of the Cold Moon Palace over tens of thousands of years!

Even if Gu Yun had no spiritual power in his dantian, he was still the ultimate theoretical embodiment of a walking grandmaster of array formations, alchemy, and talismanic arts!

Once his dantian recovers, he alone can support the entire foundation of a top-tier sect!

However, the cost was extremely high.

Gu Yun leaned against the cold jade pillar and looked into his Purple Mansion Sea of ​​Consciousness.

Blood-red butterfly mark:

[The Great Evolution into a Butterfly Deduction has ended.]

[Analysis, deduction, and imprinting of the entire Cold Moon Palace lineage have been completed.]

[The soul seemed to have witnessed four hundred years of vicissitudes, reaching the pinnacle of creation.]

[Equivalent exchange, cumulative deduction of lifespan: 210 years!]

[The subject's current total lifespan: 113 years.]

"One hundred and thirteen years."

Gu Yun stared at the number, his vision blurred, and his lips twitched uncontrollably, eventually turning into a miserable laugh that was more painful than crying.

Too bad!

323 years, minus 210 years, leaves only a mere 113 years of life left!

Living to over a hundred years old is practically no different from an old man in the mortal world suffering from a terminal illness and halfway to the grave!

"I fought tooth and nail outside, leaving rivers of blood, and finally managed to accumulate nearly four hundred years of lifespan. Then I went into seclusion to read a book, and it wiped me out of existence!"

Gu Yun clutched her aching chest, on the verge of tears.

But he doesn't regret it.

He slowly raised his hand. Although his soul was extremely weak, his fingertips moved slightly, and the surrounding air resonated with an extremely mysterious force.

That was the demeanor of a master who had a profound understanding of the five elements of heaven and earth and the myriad phenomena of formations!

If he were to encounter someone like the Yin Sha Old Demon, who had reached the Great Perfection of the Golden Core stage, now...

He didn't need to withstand the Blood-Transforming Demon Blade at all. He only needed to spend half an hour beforehand drawing a few fifth-order chain trapping and killing formations on the ground and then attaching third-order explosive flame talismans, and that old dog wouldn't even know how he died!

"Knowledge is power; the ancients were right."

Gu Yun stood up unsteadily, leaning against the wall, and walked step by step towards the outside of the library.

"Crunch"

He pushed open the heavy doors of the library.

The sunlight was blinding.

Mo Qianyan had been waiting outside the door for three days and three nights.

When she saw Gu Yun push open the door and come out, the Ice and Snow Sword Master's heart skipped a beat.

Gu Yun, standing before them, still looked young thanks to the effects of the Youth Preservation Pill and his physical body.

But his once vibrant silver-gray hair was now dull and lifeless, and his once deep and unfathomable eyes were now filled with a deathly stillness!

"Gu Yun!!!"

Mo Qianyan rushed forward and hugged the swaying Gu Yun tightly in her arms, her voice filled with unconcealed panic and heartbreak.

"You madman! What on earth did you do in there? Your soul, your very essence, how could it have become so depleted!"

Gu Yun slumped into Mo Qianyan's soft, fragrant embrace, managing a weak smile that looked more like a grimace.

"Qianyan, don't cry."

Gu Yun struggled to raise his hand and wipe away the tears from the corners of her eyes. Even with only 123 years left to live, this girl's mouth was still as stubborn as a rock in a latrine.

"I was just too engrossed in reading."

"you……"

Mo Qianyan's tears clung to her eyelashes.

In the far north of the Cangbei Spirit Realm, amidst thousands of miles of glaciers, the cold wind is like a knife.

Deep within this lifeless icy plain lies a massive underground rift valley, the desolate northern cemetery.

This place is shrouded in a thick, blood-red miasma year-round, making it a forbidden area of ​​the demonic sect Blood Fiend Valley.

In the wind and snow, two figures silently made their way to the edge of the rift valley.

"Father, the Blood River Formation of Blood Fiend Valley is just ahead."

Gu Chengfeng and Gu Yun lay in the snowdrift, looking at the rolling blood-red light curtain in front of them, and whispered.

"I've heard my mother say that even a Golden Core cultivator at the peak of their cultivation would be instantly torn to pieces if they tried to enter this formation. How can we force our way through? Should I go and distract the guards first?"

"Force your way in? Can't you use any other brain than your muscles?"

Gu Yun slapped her son on the back of the head in annoyance.

Gu Chengfeng covered his head and shut his mouth, feeling wronged.