Considering that high-grade cultivation techniques are quite troublesome to cultivate, and also consume a lot of experience points, Lu Yu chose a fourth-grade Spiritual-level non-attribute cultivation technique as his technique for further enhancing his realm.

As for advancing the realm by increasing the tier of the Bing Huo Qi Zhong Tian, it's likely that only during a major breakthrough, there is hope to advance once. After all, the cultivation process of Bing Huo Qi Zhong Tian is too complex, and the consumption of experience points is also very high.

Up until now, Lu Yu has not yet completed the cultivation of the second tier and is waiting to return to Beifeng City, to Luoyan Valley in the Qingyan Mountains to absorb the Celestial Falling Bright Flame, and to Yinming Cold Pool in Kugu Ridge to absorb the Yinming Cold Qi to complete the remaining 30% of the Body Refinement progress.

The newly selected fourth-grade cultivation technique is called the Celestial Spirit Profound Qi Technique. When cultivated to its peak, it can form a Celestial Spirit Profound Qi body armor, equivalent to a protective spiritual armor.

The more important reason is that the Celestial Spirit Profound Qi Technique has up to twelve layers, which allows one cultivation technique to enhance the realm multiple times, saving the hassle of frequently changing techniques.

The effect of the Bladeless Blade Technique at the sixth layer is a significant boost to one's Qi Blood and Spiritual Power burst ability, allowing an instant explosion of more than seventy percent of Qi Blood and Spiritual Power.

The first four layers of the Celestial Spirit Profound Qi Technique can be cultivated up to the Qi Cultivation Realm, and starting from the fifth layer, Lu Yu can enhance his realm, so the experience points for the first four layers are wasted.

The first layer requires 5000 experience points, the second layer requires 10000 experience points, the third layer requires 30000 experience points, and the fourth layer requires 80000 experience points. Cultivating to the fifth layer requires a total of 125000 experience points.

Not much, just the experience points left by a peak Qi Cultivation Realm shadow.

Starting from the fifth layer, the experience points required increase to 600,000 experience points needed to upgrade to the sixth level of the Qi Cultivation Realm.

Fortunately, this Celestial Spirit Profound Qi Technique does not need other external conditions; it only requires experience points to enhance, unlike Bing Huo Qi Zhong Tian, which needs various external conditions, making it too troublesome.

Lu Yu also doesn't have the leisure to cultivate a complex transitional technique.

In this way, Lu Yu can achieve a greater enhancement by spending the same amount of experience points, making the speed of strengthening faster than other players.

[Killed a Qi Cultivation Realm Grandmaster shadow, gained 104923 experience points, and additional 32000 martial arts experience points]

Without looking, Lu Yu directly converted the martial arts experience points into general experience points, and along with the more than 10,000 experience points left from before, upgraded the Celestial Spirit Profound Qi Technique to the fifth layer.

Just as he wanted to continue searching for peak Qi Cultivation Realm shadows to farm experience and upgrade, the scorched earth underwent changes, with sparks emerging from the cracks in the scorched earth.

More and more dark golden sparks emerged from the cracks. Soon the sparks evolved into flames, and weak dark golden flames emerged from the cracks, with the high-temperature flames causing serious distortion in the air above the scorched earth, which could be clearly seen with the naked eye.

Lu Yu could feel the terrifying power contained within the dark golden flames. The dark golden flames were like morning frost in winter, covering the ground with a thin flame carpet that could reduce all life standing on it to ashes.

"Flame of the Infernal Light, sixth-grade Divine Fire, capable of easily burning to death Core Formation Realm experts, no wonder that person said that in the sea of flames, there is no life even in the Qi Sea Realm."

Having understood the ranking of flames and ice after learning about the cultivation method of Bing Huo Qi Zhong Tian, Lu Yu had done some targeted research to identify flames like the Flame of the Infernal Light with such obvious characteristics.

After carefully sensing the power within the dark golden flames, Lu Yu frowned and corrected his previous judgment.

The real Flame of the Infernal Light could easily burn to death Core Formation Realm experts, but the dark golden flames within the Soldier's Secret Realm are just a bit of the remaining power of the Flame of the Infernal Light, far less powerful than the real Flame of the Infernal Light.

Martial Cultivators with extremely high fire resistance in the Qi Sea Realm still have a chance to enter the sea of flames.

Seeing the appearance of the Flame of the Infernal Light, Lu Yu stayed not far from the sea of flames, quietly waiting for the shadow of that dual spiritual power expert of ice and fire to appear.

During this time, there were quite a few Martial Cultivators passing by near Lu Yu, but none of them noticed Lu Yu. If a new shadow appeared, Lu Yu would not miss it either.

His target now changed from farming experience points to contacting the shadow of the dual spiritual power expert of ice and fire.

Whoosh! A whistle from the wind, and thousands of meters away from Lu Yu appeared a large number of light points, forming a vortex, and a figure slowly manifested.

Lu Yu, sensing the commotion here, came to observe the situation not far from the vortex.

The emergence of the light-shadow man made too much noise, attracting two peak Qi Cultivation Realm Martial Cultivators, with one standing less than a hundred meters from Lu Yu, warily watching the quickly forming light-shadow man.

"This is... the Qi Sea Realm third-layer Martial Cultivator shadow of Yunhai Academy?" said the wary Martial Cultivator, judging the complete light-shadow man.

Upon judging the shadow's strength, he immediately turned to leave; he had no desire to fight an opponent at the Qi Sea Realm third-layer shadow level.

Upon hearing his words as he left, Lu Yu knew that what appeared before him was a shadow from Yunhai Academy. However, he actually didn't need the person to say it; he could tell the shadow's affiliation by himself.

The Qi Sea Realm shadow's image was already very close to the real person, and the clothing on the body was also very clear, with the Yunhai Academy four-character emblem on the light-shadow person's chest, though somewhat blurry, still recognizable by Lu Yu.

"Yunhai Academy? Fifth Senior Sister mentioned she lived in Yunhai City; could Yunhai Academy be the academy of Yunhai City?" Lu Yu pondered.

No Martial Cultivators in the Qi Cultivation Realm wanted to provoke this Qi Sea Realm shadow. Feeling the Qi Sea Realm power from afar, they avoided this area, with Lu Yu also distancing himself upon confirming the shadow's strength.

The strength of the shadow at the Qi Sea Realm third-layer exceeded the limit he could kill, making it unwise to provoke it.

With the appearance of the Qi Sea Realm strength shadow, the last group of people on flying Spiritual Treasures and exotic beasts in the sky would soon enter the Soldier's Secret Realm.

From the shadow's strength of Yunhai Academy, one can see the prowess of Yunhai Academy.

The participants of the Divine Weapon Pavilion in the Qi Sea Realm are all at the peak of the Qi Sea Realm. Without reaching the peak of the Qi Sea Realm, there is no chance to qualify for the secret realm, whereas Yunhai Academy participants at the third level of the Qi Sea Realm can qualify for the secret realm. The strength differences are clear at a glance.

The number of slots also reflects the strength differences; the Five Mountains Sword Sect has only 5 slots for their Qi Cultivation Realm disciples, while the Divine Weapon Pavilion has 100 slots.

Originally, Lu Yu was worried that after entering the secret realm at the Qi Sea realm, his situation would become very difficult, constantly surrounded by peak Qi Sea Realm experts.

But now it seemed that Lu Yu's worries were somewhat excessive.

Not all forces can send peak Qi Sea Realm disciples to participate in the secret realm.

After the appearance of the Qi Sea Realm shadow, a sparse rainbow light descended from the sky not long after, showing significantly fewer participants compared to the Qi Cultivation Realm.

At the same time, the powers of various terrains became more terrifying, with gravity in Fist Valley reaching fourfold, and just being near Sword Abyss made the skin feel as if being cut by blades…

After a waiting period, Lu Yu finally awaited the descent of the shadow of the dual-spirited Ice and Fire expert.

In the secret realm, it's becoming rare to see Martial Cultivators wandering randomly. The remaining Qi Cultivation realm cultivators also started moving toward the Central Broken Mountain, which would be the final battlefield of the martial secret realm.

With flames rolling like a sea, ice islands stood silent like ports, a figure leaned on an ice throne, quietly gazing at the sea of flames.

Although the shadow of the dual-spirit Ice and Fire expert was not as formidable as those who left shadows in Fist Valley, Sword Abyss, Blade Cliff, Spear River, Finger Cavern, and Claw Marks..., it certainly wasn't someone Lu Yu could contend with.

Even though the shadow was much weaker than its main form, it was still an existence Lu Yu couldn't resist.

Considering whether to bring out the inheritance jade plate of the seven-layered Ice and Fire to lure out the expert was worth serious thought. Would bringing out this expert result in attaining his desires in peace, or would he be reduced to ashes at a whim?

This was a gamble with life as the stake.

Lu Yu pondered deeply and finally took out the cultivation technique's inheritance jade plate. The expert's shadow on the ice throne flashed with divine light in its eyes upon Lu Yu's action, and it turned to look in Lu Yu's direction.

Swish! The figure on the ice throne disappeared.

Lu Yu saw a figure appear at the edge of the sea of flames, surrounded by dark golden flames that spread like a luxurious dark golden carpet beneath the figure's feet.

He didn't step out but stood at the edge of the sea of flames, watching Lu Yu.

Lu Yu hesitated for a moment, put away the array plate, and walked toward the expert's shadow with the inheritance jade plate.

Since he hadn't attacked immediately, there might be an opportunity for communication.

The shadow of the dual-spirit Ice and Fire glanced at Lu Yu and said, "You are not a descendant of the Han family. Where did you get the inheritance jade plate in your hand?"

There was no expression in the shadow's voice, but Lu Yu knew that if he misspoke, he would likely be annihilated by the shadow of this expert.

"It was given to me by the current Han family patriarch," Lu Yu thoughtfully replied.

He wasn't exactly lying; back then, Han Yaozu had personally said he intended to pass on the seven-layered Ice and Fire Heaven to him, although whether he would give him the cultivation technique's inheritance jade plate was another matter.

He quickly explained, "The Han family has declined, residing in a remote town in the Tianfeng Province to avoid enemy pursuit, and for nearly a century, no Han family disciple capable of cultivating the seven-layered Ice and Fire Heaven has emerged."

"I was lucky to learn the seven-layered Ice and Fire Heaven, and the patriarch hopes that through me, they can find the lost subsequent techniques of the seven-layered Ice and Fire Heaven and restore the Han family's former glory."

The shadow of the dual-spirit Ice and Fire commented, "Has the Han family fallen to such a degree? The clan doesn't even have a disciple capable of inheriting the technique and has to rely on an outsider for revival!"

"What's the name of the current patriarch?" he asked.

"Han Yaozu, and the patriarch has a brother named Han Yaotong," Lu Yu replied.

"Han Yaozu, Han Yaotong; desiring glory for the clan requires one's own strength." The shadow of the dual-spirit Ice and Fire looked at Lu Yu and said, "Although you did tell some untruths, you indeed haven't stained your hands with the blood of any Han family descendant."

"I will consider you as someone the Han family can currently rely on."

Upon hearing him mention Lu Yu's falsehoods, a cold sweat broke out on Lu Yu's back. Still, upon hearing the latter comment, Lu Yu knew his life was spared, and the shadow of the Ice and Fire master would not act against him.

A red jade fragment floated out from the shadow's body; he held it in his hand and said to Lu Yu, "Swear an oath to the Heavenly Dao that you will not actively harm any Han family descendants during your lifetime and will ensure the Han family lineage continues for a century."

"After a century, if you are still alive, return a cultivation technique of equal grade to the Han family," the shadow of the dual-spirit Ice and Fire said, looking at Lu Yu.

Gazing at the fragment in his hand and then at his expression, Lu Yu swore, "I, Lu Yu, swear that I will not actively harm any Han family descendants during my lifetime, will ensure the Han family lineage continues for a century, and after a century, will return a cultivation technique of equal grade to the Han family."

Upon finishing, Lu Yu faintly felt that violating this oath would have severe consequences.

The red fragment flew towards Lu Yu and landed in his hand, while the shadow of the Ice and Fire master disappeared at the edge of the sea of flames.

"The fall of the Han family, losing the seven-layered Ice and Fire Heaven, might indeed be a blessing."

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