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

Chapter 81 Re-entering the Heavenly Flame Tower, Devouring the Heart Flame
After a short while, the violent energy fluctuations in the room finally subsided.

"Squeak..."

With a soft creak of the wooden door, Little Fairy Doctor, dressed in white, slowly stepped out. She was still enveloped in lingering poisonous mist, and her every move exuded the powerful aura of a peak-level Dou Ling.

"Little Fairy Doctor!"

Zi Yan stared wide-eyed, her face filled with disbelief, and asked, "How did you break through so quickly?"

Lu Yu, who was standing to the side, smiled but didn't say anything.

Long before he broke through to the Seven Star Dou Ling level, Xian'er had already broken through to the Dou Ling level.

After a period of arduous training, when he broke through to the level of a two-star Dou Wang, Xian'er was already a five-star Dou Ling.

Refining a bottle of fifth-tier blood poison directly elevated her from a five-star Dou Ling to the peak of a nine-star Dou Ling.

All I can say is that the fully unleashed Calamity Poison Body is indeed formidable; as long as there is a sufficient supply of poison, one's cultivation level can advance at an astonishing speed, almost like riding a rocket.

Upon hearing this, Little Fairy Doctor smiled gently. With a light wave of her hand, the poisonous mist surrounding her instantly flowed into her body like rivers flowing into the sea.

She gently rubbed Ziyan's head and said softly, "My constitution is quite special, little Ziyan. You don't need to be envious. Everyone has their own opportunities. You were born with the body of a magical beast, so you are much stronger than us when it comes to absorbing energy."

"When we have time, I'll ask your brother Lu Yu to find you a few more rare and precious herbs similar to the Dragon Pattern Fruit, so you can grow up quickly."

"really?"

Upon hearing this, Zi Yan's eyes lit up, and she looked at Lu Yu with anticipation.

Upon seeing this, Lu Yu couldn't help but twitch his lips, thinking to himself, "Does this girl really think I'm a walking treasure trove?"

"Dragon-patterned fruits are rare and precious natural treasures, not so easy to obtain. You don't know how many simulations you need to run before you can get even one. It all depends on luck..."

"Raising a dragon is really not easy; it takes even more effort than cultivating..."

As he was reflecting on this, he suddenly heard footsteps outside the courtyard.

Is Elder Lu present?

At this moment, a young student dressed in the uniform of Canaan Academy stood respectfully outside the academy gate, clasped his hands in a salute and said, "The vice dean requests that you go to the Heavenly Flame Refining Tower immediately, saying that the Origin Heart Flame you requested has been prepared."

Lu Yu's eyes lit up, and he nodded to Little Fairy Doctor, saying, "I'll be right back. This time I might be in seclusion for several months."

Little Fairy Doctor smiled gently and nodded slightly, indicating that she understood.

He then looked at Zi Yan. The little girl pouted and waved her hand, saying, "Remember to bring back some fire berries from the back mountain."

"Okay." Lu Yu replied and left with the student.

……

When Lu Yu arrived at the Heavenly Flame Refining Tower again, he found that Vice Dean Hu Qian had been waiting at the entrance for a long time.

"Haha, you've come at the perfect time!"

Hu Qian laughed heartily, patted Lu Yu on the shoulder, and said, "The Origin Heart Flame is already prepared on the seventh floor. Come with me."

"Thank you for your help, Vice Dean."

Lu Yu respectfully clasped his hands in greeting, and then followed Hu Qian into the tower.

The two continued downwards and soon passed the sixth floor, arriving at the seventh floor.

When the two stepped into the seventh floor of the Heavenly Flame Refining Tower, the scene before them made Lu Yu slightly startled.

Unlike the upper levels, the seventh level was exceptionally spacious, several times larger than any of the previous levels. Due to the scarcity of cultivation rooms, the entire space felt remarkably empty. Lu Yu's gaze was quickly drawn to the central area, where a massive opening, tens of meters in diameter, emitted an aura that drew the two strange flames within him in droves.

"Old Yu, Old Wen, it's time to get to work!"

Hu Qian said loudly towards the cave entrance.

As soon as he finished speaking, two figures suddenly appeared and landed steadily more than ten meters away from the cave entrance.

Lu Yu looked closely and saw that they were two inner court elders he had never met before. One of them smiled and looked him up and down, stroking his beard and saying, "Is this the little fellow? Not bad, not bad, a good prospect."

"Let's find a place to sit down."

Another elder pointed to the ground near the cave entrance, where twelve specially made jade platforms, emerald green and glistening with dew, were neatly arranged.

After receiving Hu Qian's approval, Lu Yu chose a place to sit down. The jade platform was cool to the touch, completely isolating him from the intense heat outside.

The two elders exchanged a knowing glance and simultaneously began to cast hand seals. Waves of energy rippled along the edge of the deep cave, and a semi-transparent barrier gradually took shape. Then, a pale white ball of light, roughly the size of a human head, slowly rose from the bottom of the cave and finally hovered before them.

Inside the ball of light, a faint flame flickered quietly—the precious Origin Heart Flame.

With a flick of his sleeve, Hu Qian caused the ball of light to float lightly down in front of Lu Yu. He then explained, "This is the Origin Heart Flame, with a protective barrier on the outer layer. Once you are ready, you only need to break this barrier to begin refining it."

He pointed around and continued, "There are special cultivation rooms here. You can absorb the energy directly here, or you can go to the cultivation room for seclusion. It's all up to you."

"Thank you for your guidance, Vice Dean."

Lu Yu cupped his hands in a respectful bow and said, "To be on the safe side, I think it would be best if I went to the cultivation room."

Hu Qian waved his hand dismissively and said, "Go on, go on. This Origin Heart Flame is only of some help to those at the peak of the Dou Ling realm. With your current cultivation level, you should be fine. You can leave on your own after you finish your seclusion."

After saying that, he turned and left.

Lu Yu carefully took the pale white light shield, scanned the spacious seventh floor with his eyes, and finally chose a quiet cultivation room in the corner before stepping inside.

The moment you step inside, a wave of scorching heat hits you. Unlike the pale red mist on the sixth floor, the seventh floor is filled with a thick, blood-red mist. Every breath feels like a fire burning in your lungs.

Lu Yu raised an eyebrow, and the Great Floating Pagoda Technique within his body began to circulate on its own. The Floating Pagoda eagerly devoured the surrounding crimson mist, and even the two strange flames within the pagoda began to stir restlessly.

He sat cross-legged in the center of the cultivation room, placing a pale white light barrier in front of him. He gathered his fighting spirit at his fingertips and gently touched the surface of the barrier.

"Click..."

With a crisp cracking sound, the light barrier shattered instantly. The seemingly invisible yet clearly visible primordial flame finally revealed its true form, burning silently in the void.

Lu Yu's gaze sharpened, and he thought to himself, "Peak of Dou Ling? It doesn't seem like it. It seems to only touch the Dou Wang level, half a step Dou Wang. It's just right for a peak Dou Ling expert, but for a Dou Wang expert, the effect is negligible."

"Oh well, I'll have to be devoured by the Earth Core Flame to recover my strength anyway..."

Thinking this, he swiftly formed hand seals, rapidly circulating the Great Floating Pagoda Technique within his body to slowly draw out the weakened Earth Core Flame. Then, he lightly tapped his fingertips and coldly commanded, "Go!"

The withered Earth Core Flame emerged in response, transforming into a crimson-blue fire python that lunged at the Origin Heart Flame with ferocious momentum. The moment the two flames clashed, the entire cultivation chamber trembled violently. Although the Origin Heart Flame lacked sentience, it instinctively struggled fiercely, sending out invisible waves of fire in all directions.

"swallow!"

Lu Yu formed hand seals, and the power of the Earth Core Flame surged instantly. Under his precise control, the Azure-Crimson Fire Python tightly coiled around the Origin Heart Flame, beginning to devour it bit by bit.

"Chichi..."

A strange burning sound continued to echo. As the absorption continued, the flames of the Earth Core Flame grew stronger, and its previously weakened state rapidly recovered. When the last wisp of the primordial core flame was completely devoured—

"boom!"

The Earth Core Flame suddenly erupted, not only fully recovering to its peak state, but also showing specks of crimson and blue light at its core, emitting an aura that was several times stronger than before!
(End of this chapter)