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

Chapter 231 The Profound Mysteries of the Great Emperor's Inner Classic!
Lu Yu immediately grabbed her wrist and gently channeled a stream of fighting spirit into her. However, the medicinal power within Cai Lin's body surged even more wildly the moment his fighting spirit touched her.

"No... that will only exacerbate the effects of the drug."

He immediately withdrew his battle qi, took out an ice-blue pill from his storage ring, and said, "This is a seventh-grade Clear Mind Pill, which may be able to suppress it temporarily."

Cai Lin forced down the pill, and the agitation around her subsided slightly, but the flush on her cheeks remained. She leaned weakly against Lu Yu's shoulder, her eight-colored hair cascading down like a waterfall, her voice slightly hoarse: "This medicinal power... seems to be resonating with my bloodline..."

Lu Yu pondered upon hearing this: "Could it be that too much of the eighth-order Devouring Python's essence blood was added to the pill? Did the Blood Burning Mortal Transformation Pill further stimulate some kind of characteristic deep within the Devouring Python's bloodline?"

He frowned. "An eighth-grade, eight-colored pill is indeed far too potent for Cai Lin, who was originally only at the peak of the Dou Zong realm. Even though she has broken through to the Dou Zun realm, she still hasn't been able to fully digest it..."

Just as he was pondering, Cai Lin gently tugged at his sleeve. A hint of struggle flashed in her beautiful, misty eyes, and her voice was barely a whisper: "Stay...with me..."

Lu Yu was slightly taken aback upon hearing this, and his gaze involuntarily fell on Cai Lin.

Her skin was as white as jade, and her figure was slender and graceful. Under the influence of the medicine, it was flushed with a faint pink hue, like peach petals blooming in early spring. Her usually cool eyes were now sparkling, with a hint of dreaminess and shyness, making her more charming and alluring than ever before.

"You scoundrel, what are you looking at..." she scolded softly, her voice weak and feeble.

Lu Yu coughed lightly, touched his nose, and quickly composed himself. He took out a moon-white robe from his storage ring and gently draped it over her shoulders. When his fingertips inadvertently touched her smooth skin, they both trembled slightly involuntarily.

Cai Lin instinctively gripped the cushion, her long eyelashes trembling slightly, her expression unreadable, only a hint of shyness flashing in her eyes.

"excuse me."

Lu Yu apologized softly, then fell into deep thought. The situation was critical; ordinary methods were unlikely to be effective…

After a moment's thought, Lu Yu said solemnly, "Cai Lin, I know a technique that might help you resolve the surging medicinal power within your body. This technique is called the Great Emperor's Inner Scripture, based on Yin and Yang energies. It can resolve all injuries and guide your Qi. If you are willing, I can teach it to you."

He paused briefly, then added, "However... this is a method of dual cultivation."

Cai Lin was about to respond when she caught a whiff of his cool, refreshing scent. The aroma, a blend of medicinal fragrance and masculine scent, made her already restless blood surge even more. She unconsciously clenched her clothes, her knuckles turning slightly white.

“Alright…I will do as you say…” Her voice trembled slightly with suppressed emotion, her eyes glistening with tears, “Quickly…pass on the method to me…”

Seeing her reaction, Lu Yu no longer hesitated. He immediately placed his finger between her eyebrows and slowly transmitted the cultivation method of the Great Emperor's Inner Scripture.

As Cai Lin received the cultivation technique, her delicate body trembled slightly, and even the tips of her ears turned blush. But the surging medicinal power within her body left no time to think. Suppressing her embarrassment, she grabbed Lu Yu's hands and prepared to circulate the technique according to the instructions.

"Wait……"

Before Lu Yu could speak, Cai Lin had already grabbed his wrist tightly. Her cheeks were flushed crimson, her eyes brimming with unbearable desire, and even her breath was burning hot: "At a time like this… what are you still hesitating for… are you even a man…?"

"I--"

Lu Yu's eyes widened instantly, a surge of anger rising within him. He grabbed Cai Lin's wrist and gritted his teeth, saying, "You'd better not regret this!"

"Stop talking nonsense..." Cai Lin's eyes reddened, her breathing erratic as she urged, "Hurry up..."

Her fingertips trembled slightly, yet she firmly guided his hand to rest on her waist. Through the thin fabric, he could clearly feel the burning heat of her skin.

The eight-colored light curtain spread out instantly, forming a hazy barrier around the two of them, separating them from the outside world.

"Circulating my cultivation technique..." Cai Lin bit her lip, trying to suppress her embarrassment, her voice broken, "I...I can't hold on much longer..."

Feeling the scalding heat from his palm, Lu Yu's heart skipped a beat. Without hesitation, he activated the Great Emperor's Inner Scripture, and a gentle yet powerful battle qi surged from his palm, slowly flowing into Cai Lin's waist meridians.

"Um……"

Cai Lin couldn't help but let out a soft moan. Under Lu Yu's guidance, the scorching medicinal power began to circulate along a specific trajectory. The eight-colored light screen trembled slightly with the circulation of the technique, enveloping the two in a hazy glow.

Lu Yu could clearly feel that the surging medicinal power within Cai Lin's body was gradually subsiding, but her breathing became increasingly rapid. Her beautiful eyes were shimmering with tears, and her originally cool face was now flushed with a captivating blush.

"continue……"

Cai Lin unconsciously moved closer, her eyes hazy and misty, her fair arms involuntarily wrapping around Lu Yu's neck. The moon-white robe draped over her shoulders slipped down, revealing her smooth skin.

The eight-colored light curtain swayed gently, enveloping the two figures embracing in a hazy halo.

"The effects of the medicine... seem to be starting to wear off..." she murmured softly, her voice growing weaker.

……

The next morning,

On the bed, Cai Lin lazily opened her eyes, her cascading eight-colored black hair cascading down her pillow. She gently circulated her cultivation technique, feeling that the originally violent eight-colored energy within her body had become docile and abundant, and her cultivation level had stabilized at the five-star Dou Zun realm.

Is the Great Emperor's Inner Classic really that profound?

She turned her head to look at Lu Yu, who was still fast asleep beside her, a complex and indescribable look flashing across her eyes, and gently covered him with the thin blanket that had slipped off.

My gaze swept over the clothes scattered on the floor beside the bed, and the erotic scenes from last night involuntarily surfaced in my mind.

Her cheeks flushed slightly as she quickly took out a dark robe from her storage ring and put it on, her fingertips trembling slightly as she fastened the belt.

How could I have been so shameless last night...

Just as she turned to leave, her wrist was gently grasped.

"Wait." Lu Yu had woken up sometime earlier, and the warm touch of his fingertips came through his sleeve. "Where are you going?"

Cai Lin paused slightly, but did not turn around. Her voice carried a deliberate air of distance: "What happened last night... was merely a temporary measure to counteract the effects of the medicine. You and I... should pretend it never happened."

"Ok?"

Lu Yu raised an eyebrow and then said, "You slept with me, and you don't want to take responsibility?"

Upon hearing this, Cai Lin turned around abruptly, a hint of embarrassment and annoyance flashing in her beautiful eyes: "If it weren't for your improper alchemy..."

"You were the one who initiated things last night..."

"Shut up!"

Cai Lin's ear tips turned red, and a wisp of eight-colored battle qi gathered at her fingertips. "If you bring up last night again, don't blame me for being impolite!"

"Great, she's murdering her husband!"

Lu Yu smiled and dodged the eight-colored battle qi. "You think you can just walk away after sleeping with your own sect leader?"

He deliberately raised his voice: "Is this how you treat the great benefactors of the snake people? Who helped you relocate to the Tagor Desert back then, and who provided you with cultivation resources..."

Cai Lin blushed with anger, her eight-colored hair fluttering even without wind: "Shut up, you shameless scoundrel!"

"You're clearly trying to repay a debt of gratitude!" "If I had known this would happen, I would never have made a deal with you back then!"

Seeing her like this, Lu Yu's smile deepened. He suddenly stepped forward, ignoring the lingering eight-colored battle aura, and gently grasped her wrist.

"Since we've already slept together," he said, his voice lowering slightly, "why don't we have a proper talk?"

Cai Lin tried to break free, but found his grip extremely firm. Those eyes, which always held a playful air, were unusually serious at this moment, causing her to freeze in surprise.

"You..." She opened her mouth, but didn't know what to say. A strange expectation arose in her heart, though she herself was unaware of it.

Lu Yu's fingertips traced the delicate skin on her wrist, his tone softening: "Give me a chance, okay?"

Seeing her eyes flicker slightly, Lu Yu took the opportunity to pull her closer. The eight-colored battle aura dissipated automatically as he approached, as if it had never existed.

“You weren’t this cold last night,” he whispered in her ear, his warm breath brushing against her reddened earlobe.

Cai Lin turned her head away, but did not struggle anymore. She thought of his care for the snake people over the years, of his repeated help, and of his gentle care as he carefully guided the medicine to her last night... The resistance in her heart gradually turned into a soft sigh.

"Whatever you want." She turned her face away indifferently, but let him hold her hand.

----------------------

Shortly afterward, the two, dressed neatly, were preparing to leave the main hall.

Lu Yu's expression suddenly shifted slightly as he sensed a number of familiar presences gathering outside the hall. He gently pressed Cai Lin's wrist and whispered, "There are people outside. Leave through the side hall first, and tell them you're in seclusion to stabilize your cultivation."

Cai Lin understood, and with a gentle lift of her jade hand, she tore through space, her figure disappearing into the void.

When Lu Yu walked out of the main hall alone, he indeed saw Little Fairy Doctor, Venerable Heavenly Fire, and others waiting outside. Seeing him come out alone, the crowd looked puzzled.

"Where is Sister Cailin?" Little Fairy Doctor asked with concern.

"She has just broken through and is currently in seclusion to consolidate her realm."

Lu Yu explained with a calm expression.

At this moment, Zi Yan suddenly wrinkled her small nose and looked around suspiciously: "Strange... there seemed to be a fluctuation of spatial power just now..."

Lu Yu's heart skipped a beat, but he remained calm on the surface: "Perhaps the spatial ripples caused by Cai Lin's breakthrough have not yet completely subsided."

"Oh? Is that so?" Zi Yan tilted her head, her amethyst-like eyes still holding a hint of doubt.

Seeing this, Lu Yu immediately changed the subject: "Since you're all here, there's something I need help with. I'm looking for two rare treasures, the Soul Infant Fruit and the Spirit Dragon Heavenly Mushroom. Zi Yan, could you ask the Ancient Void Dragon Clan to keep an eye out for them as well?"

Zi Yan's attention was indeed drawn, and she patted her chest, assuring him, "Leave it to me! Our Taixu Ancient Dragon Clan is the best at searching for rare and precious treasures!"

"I'll go back and inform the clan, and ask everyone to help search!"

Little Fairy Doctor smiled gently upon hearing this and said softly, "Our Spirit Treasure Pavilion can also spread the word. Now that you have broken through to the Half-Saint level and have befriended the Ancient Clan and the Thunder Clan, those forces that previously dared not associate with us because of their fear of the Soul Palace have now taken the initiative to send us their invitations."

She took out a jade slip and handed it to Lu Yu: "These are some cooperation requests that have been sent recently, including from major chambers of commerce and intelligence organizations in Zhongzhou. If we use the search for these two medicinal herbs as an excuse, it should save us a lot of time."

Lu Yu took the jade slip and looked at Little Fairy Doctor with gentle eyes: "You've worked hard these past few days. I'll start refining a Netherworld Soul-Eroding Pill for you. With my current alchemy skills, I should be able to upgrade it to the peak of the eighth grade."

Little Fairy Doctor's eyes brightened slightly upon hearing this, but she still softly declined, "There's no need to waste your energy on me, the others in the pavilion..."

"It doesn't matter."

Lu Yu interrupted with a smile, "Your improvement in cultivation is also a good thing for the Spirit Treasure Pavilion. Besides..."

He glanced at everyone present and said, "To deal with the Soul Palace, we all need to improve our strength as soon as possible."

Everyone nodded when they heard this.

……

Three days later, the sky above Lingbao Pavilion suddenly darkened, and thick, dark clouds rapidly spread across the horizon like ink. Streaks of silver snakes swam through the clouds, quickly condensing into nine-colored lightning, each color containing a terrifying power of heaven and earth.

"Boom!"

Amidst the thunderclouds, a black streak of light could be seen swimming among them; upon closer inspection, it turned out to be a hundred-foot-long black dragon.

The dragon's body nimbly flipped and turned amidst the lightning, and with a slight sway of its tail, it instantly moved thousands of feet. Nine-colored lightning whistled past, grazing the dragon's scales, leaving only a scorched mark on the horizon.

Immediately afterwards, several more bolts of lightning struck down in succession, weaving into an impenetrable net of lightning in the air. The black dragon roared, shaking the heavens, and ripples spread through the space around it. With each movement, it left behind a lingering afterimage, causing the dragon to misjudge the situation.

Rumble!
The thunder seemed to be completely enraged, with countless bolts of lightning pouring down like a torrential rain, tearing the entire sky into numerous spatial rifts and completely blocking all escape routes.

At the critical moment, the black dragon opened its mouth and spat out a beam of eerie light—it was the fire spirit Xiao You. It stretched its body in the air, transforming into a bottomless vortex that swallowed all the lightning in the sky. Then, it spun around contentedly and disappeared back into its mouth.

As the thunderclouds dispersed, the black dragon transformed into human form amidst the sky full of lightning and gracefully landed—it was Lu Yu!
Inside a courtyard,
Mang Tianchi stroked his beard and laughed, "To be able to emerge unscathed from such a violent lightning tribulation, it seems that this kid's movement technique has reached a high level, and he is probably no less powerful than a true Dou Sheng."

Gu Yuan remained silent, but snorted coldly: "No matter how skillful your movement technique is, it cannot hide your frivolous nature."

His gaze swept over Little Fairy Doctor, who was anxiously waiting not far away, and his tone was somewhat sarcastic, "She certainly knows how to please women."

At this moment, Lu Yu gracefully landed and handed a pill imbued with potent poison to Little Fairy Doctor. Sensing the chill emanating from the courtyard, he slowly walked over and happened to overhear Gu Yuan's words.

"Elder Gu Yuan seems to have a prejudice against me?" Lu Yu smiled calmly.

Gu Yuan stood with his hands behind his back, his aura suddenly becoming sharp: "I am indeed itching to try it out. I have heard that Pavilion Master Lu's array formations are profound. I have long wanted to test Pavilion Master Lu's skills. I wonder if you would be willing to teach me?"

Upon hearing this, Lu Yu gave him a strange look. Sensing the other party's cultivation level of a one-star Dou Sheng in the early stage, he couldn't help but chuckle and said, "Elder Gu Yuan, I'm not joking, but swords and spears have no eyes. My knowledge of formations is now vastly different from what it used to be."

"You're probably..."

He stopped himself from speaking, thinking that although this ancient clan elder was quite powerful, with his current strength and mastery of formations, dealing with a one-star Dou Sheng should be no problem.

Gu Yuan stood with his hands behind his back, waved his sleeve, and said calmly, "Why does Pavilion Master Lu need to refuse? Although I am not talented, I have seen a bit of the world."

"Since we are fortunate to meet today, I would like to learn from Pavilion Master Lu's renowned array formation skills that have made him famous throughout the Central Plains."

Lu Yu shook his head helplessly. The other party was determined to do so, and it seemed that he could not refuse.

However, I can hold back a bit when we fight later, since the opponent is an elder of an ancient clan, and I can't make him too embarrassed.

Thinking this to himself, he then smiled and nodded, saying, "In that case, I'll take my leave."

(End of this chapter)