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

Chapter 93 The Legacy of the Mangtian Ruler, the Fallen God Black Iron

Lu Yu cupped his hands in a salute and said with a smile, "Then this junior will respectfully accept your offer. Thank you for your kindness, Elder."

Su Qian stroked his beard and chuckled, saying, "It's alright. Since the timing is perfect, why don't we take you to the library now?"

Seeing Lu Yu nod in agreement, Su Qian waved her sleeve, and ripples immediately spread through the space.

When Lu Yu's vision cleared, he found himself in a secluded valley surrounded by mountains on three sides. In the center of the valley's open space, a simple and imposing blue stone pavilion stood majestically, which was the location of the library.

"We've arrived." Su Qian pointed to the plaque in front of the pavilion.

Lu Yu looked up and saw that the weathered plaque still hung high, with the three characters "Zangshuge" (Library Pavilion) on it as vigorous as ever.

Suddenly, a blur appeared before their eyes, and two figures in gray robes had silently appeared in front of the pavilion.

"Little Su, what brings you here today with a newcomer?" one of the gray-robed elders asked with a smile.

Su Qian cupped his hands and said, "I brought this newly promoted elder here to choose a suitable treasure."

The two elders' eyes flashed like lightning as they swept over the two men, and their expressions immediately showed surprise.

"This kid...didn't he just come here a year ago?"

As he stroked his beard, Qian Lao's eyes gleamed with a sharp light, and he couldn't help but exclaim in amazement, "So quickly you've advanced to the Dou Wang level? Truly, the younger generation is formidable..."

Suddenly, Elder Bai let out a soft "Eh": "This Earth Core Flame... seems to be much stronger than last time?"

He scrutinized Lu Yu closely, his voice filled with amazement, and said, "What's even more remarkable is that he also has two more strange flames..."

Elder Qian narrowed his eyes, a peculiar energy fluctuation emanating from his body. He focused intently on sensing them, then slowly said, "These three strange flames are all extraordinary. Although none of them are on the Strange Flame Ranking, their power is still remarkable..."

"The strongest one, in my opinion, is probably no weaker than the Bone Spirit Cold Flame, which ranks eleventh on the Strange Flame Ranking. Given time, it may very well break into the top ten of the Strange Flame Ranking..."

He turned to Su Qian and said meaningfully, "Little Su, the little guy you brought this time is no ordinary person."

Upon hearing this, a hint of relief flashed in Su Qian's eyes. He cupped his hands and said, "You two have discerning eyes. This child is indeed exceptionally talented, so we made an exception and allowed him to enter the secret pavilion of the library again to choose an opportunity."

The two elders exchanged a glance. Elder Qian nodded slightly and said, "Very well, since it is a rule set by the Dean, we should abide by it."

The two old men simultaneously made hand seals, their sleeves fluttering even without wind. Their hands traced mysterious trajectories in the air, and strands of silver runes appeared out of thin air, weaving into complex spatial chains in front of the library's entrance.

"open!"

With a soft shout from the two elders, the silver chains snapped inch by inch, dissipating into starlight. The heavy doors of the library slowly opened, revealing a deep, secluded corridor inside.

Elder Bai turned to Lu Yu and said, "The Secret Pavilion has been opened for you. As before, you only have one hour."

Qian Lao then added, "Remember, you can only choose one item. This is your only chance; there will be no more opportunities in the future."

Su Qian patted Lu Yu's shoulder gently and said earnestly, "Go ahead, I hope you can find something you like."

Lu Yu solemnly cupped his hands in greeting, then stepped into the library's main gate. Upon entering, a blinding light immediately filled his vision, followed by a slight dizziness. When his vision cleared, the scene before him had completely transformed.

He found himself in a magnificent hall, with dozens of ancient stone pillars standing majestically. Each pillar was topped with a semi-transparent energy shield, within which floated various rare treasures:

On the third stone pillar on the left, a green spiritual fruit floats quietly, its entire body as green and translucent as jade, exuding a refreshing fragrance that invigorates the mind; on the seventh stone pillar on the right, a seventh-order magical beast core made of a sky-piercing purple crystal exudes a powerful pressure, with faint lightning snakes visible as purple light flows, and subtle ripples appear in the surrounding space.

Further away, the inner armor of an unknown magical beast gleamed with a dark luster, and numerous scrolls of cultivation techniques and combat skills floated in the air. Looking around, there was nothing below the Earth Rank!
However, many of the stone pillars are now empty, clearly indicating that their treasures had been taken away by previous inhabitants. At present, only about fifty items remain.

"Is this all there is?"

Lu Yu frowned slightly, his gaze sweeping over the fifty-odd items displayed in the hall. About half of them were magic cores of seventh-tier or higher magical beasts and rare ores. Although they were valuable, they were of limited use to him.

The other part consists of unorthodox techniques, mostly those with obscure attributes such as darkness and poison, which have demanding cultivation conditions.

Finally, a few rare medicinal herbs remained, which, although potent, were mostly used as supplementary remedies.

"Never mind, since it's a matter of chance, why be picky?"

Lu Yu shook his head and chuckled, then slowly swept his gaze across the remaining fifty-odd treasures.

Each item in the collection is accompanied by a jade slip written by Dean Mang Tianchi himself. The handwriting is unrestrained yet rigorous.

"Seventh-tier Purple Lightning Thunder Eagle Demon Core - When I was young, I chased this feathered beast for three days and three nights and almost got struck by lightning and turned into charred remains. Suitable for hotheads who want to cultivate lightning attribute techniques, it would also be good for alchemy."

Lu Yu couldn't help but smile, his gaze shifting to the crystal-clear spiritual herb beside him.

"Millennial Mystic Ice Grass - casually obtained from the far north. Only suitable for ice-attribute cultivators of Dou Huang level or above. Those with insufficient cultivation should use with caution."

Just as he was about to look away, a completely crimson crystal suddenly caught his attention. Magma seemed to flow within the crystal, radiating astonishing fire-attribute energy. The annotation on the jade slip by Mang Tianchi was concise and to the point:

"The Earth Core Fire Essence contains the essence of earth fire from a thousand years ago, and it is still usable."

Just as he was pondering this vague assessment, his peripheral vision suddenly caught sight of an inconspicuous piece of dark metal in the corner. When his gaze fell upon the corresponding jade slip, his breath caught in his throat:
"The Fallen God's Mysterious Iron is of the same origin as the Fallen Heart Flame. When I subdued the Heart Flame, I found this iron next to its original fire seed. The two have been together for countless years."

Characteristics: Possesses extremely high temperature resistance, perfectly capable of withstanding the power of different flames. After being tempered by different flames, it can be molded into a weapon, exhibiting extremely high compatibility with fire-attribute cultivation techniques. Adding this substance during weapon forging can significantly improve the efficiency of fire-attribute energy conduction.

Note: This iron contains a trace of the essence of Heart Flame. It must be suppressed with a powerful, strange fire during refining, otherwise a backlash may occur.

Lu Yu's gaze was intense, and the three strange flames within his body resonated strongly at the same time. He reached out to touch the energy shield, but was repelled by a repulsive force.

"interesting."

He raised an eyebrow slightly, and golden flames rose from his palm as he once again probed the energy shield. This time, an invisible wave of detection swept over his entire body.

After a brief silence, the energy shield rippled and activated on its own. The piece of Fallen God Iron slowly floated out, its jet-black surface covered with crimson patterns, writhing like a living thing and radiating a scorching heat.

The black iron was about the size of a fist, irregularly shaped, with an uneven surface that gleamed with a metallic luster. Most remarkably, the crimson patterns on it changed in brightness and darkness with the fluctuations of the strange fire within Lu Yu's body, as if it were breathing.

"That's it."

Lu Yu surveyed the hall, knowing that this byproduct of the Fallen Heart Flame was one of the most valuable artifacts in the hall.

It must be because of the special testing mechanism set up by the dean that no one has been able to take it away.

……

(End of this chapter)