The process of sword refining was extremely terrifying. Ordinary people who witnessed it would be scared to death on the spot.

Shi Feiyang sat on the Central Dharma Platform, holding the Nine Heavens Yuan Yang Ruler in his right hand and casting spells with his left hand.

At first, it was manageable. Long Meng divided the Qiantian Spirit Bamboo charcoal, which had been prepared in advance, into nine parts and fed them into each of the Eight Diagrams Furnaces. Huo Wuhai breathed out nine fierce fireballs from his mouth to ignite the charcoal, and Deng Bagu first added True Water to purify the furnaces, while Long Meng fueled the fire by inducing air into the cracks.

As the temperature continued to rise, the metal used for the Heavenly Demon Immortal Slaying Sword mold was exceptionally hard, and Shi Feiyang further added the Taiyin Essence produced by a small rhinoceros from the West, making it difficult to soften the metal.

In the end, those Independent Immortals by the furnace were baked until their skin ached, and their hair and beards curled. If they hadn't taken the Qingliang Elixirs distributed by Shi Feiyang in advance, they wouldn't have been able to endure.

When the sword mold finally softened, the formal forging began, with one person casting spells and another swinging the hammer, alternating every two hours.

During their forging process, Shi Feiyang continuously cast spells and spat out Essence Energy for refining.

First, he ceaselessly bent and hammered the iron block, infusing it with Essence Energy throughout the process, completely refining it over three days and three nights.

Shi Feiyang then distributed Elixirs for them to consume and subsequently released nine demons.

The demons he chose had been evil and ferocious before falling into the hands of One Light Master, who transformed them into Divine Demons. Later, they were trapped inside the Secret Demon God Lamp. Their Three Souls and Seven Spirits were divided into ten parts, each undergoing reincarnation—some turned into insects, others into fools, continually reincarnating until they finally merged back together.

Most demons, after such cycles of life and death, had their malicious spirits worn out and could reincarnate normally.

However, these demons not only retained their malice, but it grew substantially.

It was as if, faced with the same adversities, two monks reacted differently: one could transform misfortune into a path of greater fortune, vigorously advancing in the Buddhist Law even faster than in peaceful times. The other might succumb to troubles and break down, falling into evil ways.

These demons turned adversities into "opportunities" within the Demon Path, fostering significant growth in their demonic powers.

Now these three thousand demons, each fiercely uncontrollable and immensely powerful, could instantly turn the entire world into a Demon Domain if they all escaped. Even Shi Feiyang would find it difficult to subdue them all, unless he gathered all the mighty experts of the era, which would still take over a hundred years of hard effort to capture them.

In any case, keeping them brought no benefits. If one day the Secret Demon God Lamp had an accident, or when his own fate turned ill, if they all burst out, it would lead to severe destruction.

He might as well use them for sword refining to avoid many future troubles!

Shi Feiyang first took out nine demons, restraining them with the Nine Golden Flowers on the Yuan Yang Ruler and brought them to each furnace.

As soon as these demons appeared, the minds of everyone in the Underground Palace buzzed, and when they looked around again, their surroundings had turned into a blood-red world. The flames in the furnaces became surging blood, the howling wind turned into heart-wrenching screams, and their companions around them were covered in blood, looking at their own with sinister smiles.

Sitting on the Dharma Platform, Shi Feiyang saw Deng Bagu emanating a moonlight-like Qingliang light from her entire body, surrounded by Ice Soul Colorful Light; Huo Wuhai's eyes flickered with flames. Only these two were able to resist, while the rest succumbed to the illusion.

Fortunately, everyone had brought Demon-suppressing Talismans and had ingested Qingliang Dan beforehand. Although they fell into the illusion, they did not lose their senses, knew the visions were illusions, felt somewhat panic, but did not act rashly.

Shi Feiyang waved the Nine Heavens Yuan Yang Ruler, releasing streams of purple energy that enveloped everyone, restoring their senses. Everyone gasped, feeling a chill, frightened by how vulnerable they would have been to such demon spells elsewhere, likely falling irretrievably into the Demon Domain and being manipulated at will.

Shi Feiyang said, "This is also the best opportunity for your cultivation. Today, I will protect you with purple energy, but gradually I will reduce its density, and eventually withdraw it completely. If you can subdue both internal and external Demon Domains purely by your own nature, it will greatly benefit your future path to immortality!"

Everyone, especially Yu Xiao and Yang Li, knew the rarity of this opportunity. Their own sects always taught them to stay away from demons and avoid any entanglements, never actively capturing demons to protect beside them as they cultivated. Besides Mr. Zhong, those overseas Independent Immortals could not contest such powerful demons either.

They all revitalized their spirits, following Shi Feiyang's instructions, steadying their minds and hearts while confronting the falling demons.

The nine demons, bizarre and grotesque in appearance, were tightly bound by the Nine Golden Flowers. They struggled vigorously, constantly changing forms—sometimes sprouting a thousand hands and eyes, sometimes shrinking into a mass of writhing flesh, at times bursting into laughter, at times wailing loudly, yet unable to escape the Golden Flowers.

The Golden Flowers flew onto the sword, suddenly spinning upside down, casting a beam of light that pinned the demons onto the sword mold.

Shi Feiyang simultaneously cast spells and spurted out nine beams of white light onto the Golden Flowers. Inside the light of the flowers, a talisman formed, hidden on the sword mold, firmly capturing the demons.

"Start!"

At the command, nine people swung their hammers simultaneously. Ding ding dang dang, hammer after hammer smashed onto the red-hot iron block. The iron was folded over the demons, continuously forged, relentlessly hammered, folded over and over again, infinitely repeating.

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