While the player is in Battle Through the Heavens, the system is in The Great Ruler.

Chapter 80 Demonic Flame Submits, Five-Star Battle King!
Time ticked by, and only the crackling of the flames and Lu Yu's heavy breathing remained inside the cave.

He endured the throbbing pain in his meridians, gritted his teeth, and used the Great Floating Pagoda Technique as a guide to forcefully circulate the raging Netherworld Demonic Fire within his meridians.

Wherever the dark flames passed, the thick ice layer was scorched down to a thin layer, and the rising cold mist was completely burned away, leaving only the blood-red membrane formed by the Blood Lotus Pill struggling to hold on.

"Well……"

A sudden, excruciating pain struck, causing Lu Yu's vision to go black, and the Floating Pagoda within his body suddenly burst forth with azure and crimson light.

The Earth Core Flame sensed the aura of the unfamiliar flame and began to stir wildly; the Netherworld Heart Demon Flame also seemed to be provoked, and its temperature suddenly soared.

"Humph……"

Lu Yu groaned, a trickle of blood spilling from the corner of his mouth, but he didn't bother to wipe it away. He activated the Great Floating Pagoda Technique with all his might, and the Floating Pagoda shone brightly, forcibly separating the two raging strange flames like an insurmountable chasm.

"We must fight quickly!"

A resolute look flashed in Lu Yu's eyes, and his fighting spirit poured out like a flood bursting its banks, frantically urging the Netherworld Heart Demon Fire to complete its final cycle.

The dark flames seemed to possess sentience; sensing the danger, they suddenly transformed into countless lightning snakes, darting through the meridians. Lu Yu was prepared; his soul power formed a net, forcing them into a specific meridian.

"Click——"

Another crisp sound of ice breaking rang out. Looking inward, one could see that the remaining icy spring water on the meridian walls was about to be completely burned away by the dark flames.

"Give me the town!"

Lu Yu suddenly roared, his hands forming a hand seal as fast as lightning. The Floating Pagoda trembled violently, completely sealing the Earth Core Flame into its base, and at the same time unleashing an extremely powerful sealing force that instantly suppressed the Netherworld Heart Demon Flame.

"Rumble--"

A muffled thunderous roar suddenly erupted from the dantian, causing the entire cave to tremble. The unruly demonic fire finally submitted, and as the fire completed its final cycle, a strange change occurred!
The Netherworld Demonic Flame trembled violently, and a profound lightning rune suddenly appeared at the core of the flame. Lu Yu had a sudden inspiration, and his soul power instantly wrapped around it, completely refining it.

"boom--"

A muffled thunderous roar exploded within Lu Yu's body. The Netherworld Heart Demon Fire was finally successfully refined, transforming into a dark fire lotus, which was then absorbed into the Floating Pagoda.

In an instant, a surge of energy burst forth like a flood bursting its banks, instantly coursing through his entire body.

Lu Yu's bones cracked like popping beans, his muscle fibers reformed like a bowstring, and foul-smelling black impurities seeped from his skin, yet his aura continued to rise!
Samsung Fight King!

Four-Star Battle King!

Five-Star Dou King!

He finally settled steadily at the five-star Dou Wang realm, and his Dou Qi even condensed into a materialized lightning and fire armor!

"call……"

Lu Yu let out a long sigh, then suddenly opened his tightly closed eyes. His eyes seemed to be filled with a mixture of thunder and fire, shooting out a terrifying light in the dim cave.

He slowly raised his right hand, and a dark flame hissed and ignited in his palm, with lightning flashing at its core, casting eerie shadows on the cave walls.

"Is this... the power of the Netherworld Demonic Flame?"

Feeling the surging new power flowing within him, a smile unconsciously crept onto Lu Yu's lips. Suddenly, his expression shifted slightly, and he immediately focused his inner energy on his dantian—

The pagoda was now crystal clear and jade-like, with ancient runes clearly visible on its surface, indicating that it had completed ninety percent of the tempering process!
"So that's it..."

Lu Yu was taken aback at first, then his eyes gleamed brightly.

He gently stroked his chin, a look of understanding flashing in his eyes: "The strange fire, such a rare and wonderful thing, inherently possesses the supreme divine effect of cleansing the marrow and strengthening the foundation. This time, refining the Netherworld Heart Demon Fire has inadvertently promoted the tempering of the Floating Pagoda."

"This is a pleasant surprise..."

Lu Yu sighed softly, his fingertips unconsciously tapping lightly on his knees as he pondered, "The tempering of the Floating Pagoda is inherently difficult. Apart from relying on its own energy to nurture it day by day, there are very few rare and precious materials in the world that can accelerate its tempering..."

"If I don't rely on the ancestral tower of the Ancient Buddha Clan to help me advance to the Earthly Sovereign realm, it will probably take hundreds of years of tempering to elevate the Buddha Tower to a sacred artifact..."

"After all, sacred objects possess spirits. Even in the Great Thousand Worlds, the creation of a sacred object requires hundreds of years of refining, and the slightest carelessness during this period can lead to the loss of all previous efforts..." "As for the Strange Fire, it can be considered the most unique natural wonder of the Dou Qi Continent. The power of twenty-two Strange Fires can even create a Dou Di. It is not impossible for my Floating Pagoda to be promoted to a sacred object..."

"What's more, I also have a simulator. Perhaps I won't need to collect that many different flames to complete that transformation..."

"Lu Yu, are you ready yet?"

Just then, Zi Yan's clear voice suddenly came from outside the cave, accompanied by impatient stomping of her feet.

Lu Yu shook his head and chuckled, then waved away the barrier at the cave entrance. There stood Zi Yan, her cheeks puffed out, clutching a half-eaten, mangled ginseng.

"If you don't come out soon, I'm going to rush in and see if you've gone mad with qi..."

"Hmm, your aura..."

Suddenly, her bright eyes widened, her little face full of surprise. She, who had already broken through to the eighth-star Dou Wang level, actually felt a dangerous aura emanating from Lu Yu that made her heart tremble.

"you……"

Zi Yan unconsciously took a half step back, her voice rising eight octaves as she exclaimed incredulously, "How did your cultivation suddenly become a five-star Dou Wang?!"

Lu Yu smiled and nodded, saying, "I was fortunate enough to have some opportunities."

His gaze fell on the ginseng in Zi Yan's hand, and he raised an eyebrow: "Didn't I give you a few bottles of pills? Why are you still gnawing on medicinal herbs?"

"Bah bah bah!"

Zi Yan stuck out her tongue in disgust, then took a big bite of the ginseng in a huff, and mumbled, "The candies you gave me are delicious, but they're too weak in energy."

She waved the medicinal herbs in her hand with a pitiful look and said, "If I want to grow up quickly, I can only eat these awful things..."

Lu Yu was taken aback, then said, "That was my oversight. Give me the herbs, and I'll help you refine them..."

"Okay, okay!"

Zi Yan's face immediately lit up with a smile, and she hurriedly stuffed the ginseng, which had been chewed into pieces, into Lu Yu's hand. Her amethyst-like eyes shone brightly, filled with anticipation.

Lu Yu took the medicinal herbs, and with a hiss, the Netherworld Demon Flame ignited in his palm. The herbs rapidly melted and purified in the flames, and impurities turned to ash and scattered.

His fingers flew like butterflies flitting among flowers, and at the right moment he added a few purple heart grasses. The medicinal liquid quickly condensed into dozens of crystal-clear purple pills, emitting an alluring fragrance.

"Try it." Lu Yu smiled and handed over the pill.

Zi Yan couldn't wait to grab one and pop it into her mouth. Her eyes immediately curved into crescent moons as she exclaimed happily, "So sweet! Much better than before!"

The two returned to the courtyard, chatting and laughing. Just as they stepped through the gate, suddenly—

"boom!"

A violent energy surge swept over. Above the quiet chamber where Little Fairy Doctor was in seclusion, the dark green poisonous mist had condensed into a huge vortex with a diameter of more than ten feet.

Under the shroud of the poisonous fog, the plants in the courtyard withered and died at a visible speed, and the poison quickly spread to the surrounding areas.

"Is this... about to break through?"

Lu Yu's expression hardened, and he instinctively shielded Zi Yan behind him.

Before the words were even finished, a thick, dark green beam of light, as thick as a bucket, shot into the sky, piercing straight through the clouds. Inside the quiet room, Little Fairy Doctor's aura surged like a rocket!
Five-Star Battle Spirit...

Six-Star Battle Spirit...

Seven Stars Fighting Spirits...

It finally came to a slow stop at the peak of the nine-star realm.

Zi Yan stared in disbelief and exclaimed, "What did you all eat? How come your cultivation levels have improved even faster than mine?!"

(End of this chapter)