The treatment process was far more complex than anticipated, because Yu Tiancheng faced a fundamental problem—neither Dugu Yan nor Dugu Bo could directly enter the waters of the Ice and Fire Yin Yang Well.
Standing at the edge of the well, Yu Tiancheng carefully observed the starkly divided red spring and blue spring, his mind rapidly deducing the treatment plan.
The waters of the Ice and Fire Yin Yang Well contained extreme heavenly and earthly energy. Anyone who had not taken a specific Immortal Herb would be injured upon contact—this was an ironclad rule clearly recorded in the Myriad Poisons True Interpretation.
"Senior, Miss Yan," Yu Tiancheng turned to face the two, "neither of you can directly touch the waters of the Ice and Fire Yin Yang Well."
Dugu Bo nodded: "This old man has lived in seclusion here for decades, only cultivating at the edge, never daring to truly step into these waters. This old man knows their power best."
"Then how do we treat it?" Dugu Yan asked urgently.
Yu Tiancheng pondered for a moment, then his eyes suddenly lit up: "I have it."
He took out a large number of jade bottles, jade boxes, and a set of specially made silver needles from the Time-Space Ring.
These silver needles were different from ordinary acupuncture needles; they were translucent throughout, with a faint flowing light visible within the needle bodies.
"These are 'Energy Guiding Needles,' refined from deep-sea cold jade mixed with space crystal stones. They can briefly carry the power of ice and fire."
Yu Tiancheng explained, "I will use these needles to draw out the energy of the spring waters and treat you."
"Draw it out?" Dugu Bo frowned. "The energy of the Ice and Fire Yin Yang Well is so violent, how can you control it?"
"Senior, please wait and see."
Yu Tiancheng said no more. He first walked over to Dugu Yan: "Miss Yan, please sit cross-legged here."
He chose a flat rock five zhang away from the Ice and Fire Yin Yang Well and had Dugu Yan sit down.
Then he himself walked to the edge of the well and carefully used a jade bottle to collect some spring water—half a bottle of red spring and half a bottle of blue spring.
This process seemed simple, but was actually extremely dangerous. Yu Tiancheng's hands were covered in a layer of silver-white Time-Space Power before he dared to touch the spring water.
Even so, he was extremely cautious while collecting it, afraid of spilling even a single drop.
After collecting the water, Yu Tiancheng returned to Dugu Yan's side. He placed the two jade bottles on the ground and held three Energy Guiding Needles in each hand.
"I'm beginning."
As his words fell, Yu Tiancheng's left hand pierced three needles into three acupoints on Dugu Yan's left shoulder, and his right hand pierced three needles into three acupoints on her right shoulder.
The moment the needles entered, both his hands formed seals simultaneously, and the secret method of the Myriad Poisons True Interpretation began to circulate.
A shocking scene appeared—
The red spring in the left jade bottle transformed into a wisp of crimson stream, slowly flowing along the Energy Guiding Needle into the acupoint on Dugu Yan's left shoulder; the blue spring in the right jade bottle similarly transformed into an ice-blue stream, flowing into the acupoint on her right shoulder.
One hot and one cold, two streams of energy converged within Dugu Yan's body, but they did not clash. Instead, guided by the Myriad Poisons True Interpretation, they formed a miniature Ice-Fire Tai Chi Diagram, slowly rotating.
"Ah..." Dugu Yan let out a muffled groan, her left half burning hot, her right half freezing cold.
But soon she felt that the Jade Phosphorous Serpent Poison, deeply buried in her bone marrow, began to loosen and stir under the stimulation of this ice-fire energy.
"Hold on." Yu Tiancheng's voice was steady. "Miss Ye, please help me protect her heart meridian."
Ye Lingling was already prepared. The Nine Heart Begonia bloomed, and a pale blue healing halo enveloped Dugu Yan.
For the next three hours, Yu Tiancheng focused entirely on controlling the ice-fire energy. The Energy Guiding Needles in his hands constantly shifted positions, from the shoulders to the back, then to the limbs, and finally piercing into the vital acupoints on the head.
Jade-green venom seeped out from every pore on Dugu Yan's body. At first it was fine beads of sweat, but soon it turned into a viscous poison liquid.
The poison liquid dripped onto the ground, corroding small pits into the rock and emitting a pungent odor.
When the last wisp of dark green poison gas was expelled from Dugu Yan's Baihui acupoint, her entire body collapsed forward as if drained.
Ye Lingling quickly supported her, the healing halo operating at full power.
"Forty percent of the poison has been expelled." Yu Tiancheng withdrew all the silver needles, sweat beading on his own forehead from exhaustion. "The rest needs slow adjustment, but at least it's no longer life-threatening."
Dugu Yan slowly opened her eyes, feeling the long-lost lightness in her body. Tears silently slid down her face.
Next came the true main event—detoxifying Dugu Bo.
A Titled Douluo-level Jade Phosphorous Serpent Poison had already penetrated deep into the bone marrow and merged with the Martial Soul. The difficulty of treatment was more than ten times that of Dugu Yan.
Yu Tiancheng sat opposite Dugu Bo, with eight jade bottles placed between them—four of red spring and four of blue spring.
"Senior, your poison is too deep; it needs a stronger energy impact." Yu Tiancheng's expression was grave. "I will first use sixteen needles to lay down an 'Ice-Fire Spirit Guiding Array' on your body surface, channeling the energy from all eight bottles simultaneously. The process will be ten times more painful than Miss Yan's. You must completely release your suppression of the poison."
Dugu Bo took a deep breath: "Come. This old man has endured for decades; I can bear this moment of pain."
The treatment began.
Sixteen Energy Guiding Needles pierced into sixteen vital acupoints all over Dugu Bo's body at the same time.
Yu Tiancheng's hands formed seals so fast they left afterimages, the Myriad Poisons True Interpretation operating at its limit.
The spring water in all eight jade bottles boiled simultaneously, transforming into eight streams of energy that crazily surged into Dugu Bo's body along the Energy Guiding Needles!
"Urgh—!"
Dugu Bo let out a suppressed roar, his entire body trembling violently.
The terrifying Jade Phosphorous Serpent Poison erupted completely within him. Dark green poison gas sprayed out from every pore, coalescing behind him into a massive phantom of a Jade Phosphorous Serpent Emperor!
The phantom raised its head and hissed, releasing a terrifying pressure worthy of a Titled Douluo!
Liu Erlong's expression changed drastically. She instinctively moved to strike, but was stopped by a look from Yu Tiancheng.
"This is a necessary process!" Yu Tiancheng gritted his teeth, his hands forming seals that shifted without pause. "If the toxins aren't fully activated, they can't be expelled!"
One day, two days, three days...
The entire valley was shrouded in dark green poisonous mist. The ground around the Ice and Fire Yin Yang Well was corroded into a pockmarked mess, and even the distant trees began to wither.
Dugu Bo's aura grew weaker and weaker, yet the phantom of the Jade Phosphorous Serpent Emperor behind him gradually turned translucent—the toxins were being expelled!
On the third day at dusk, as the sun set.
Yu Tiancheng struck with his final set of needles—nine needles launched together, piercing straight into the nine poison sacs at the core of Dugu Bo's Dantian.
"Nine Needles Return to Origin, poison scatters and soul clears!"
"Pfft—!"
A stream of venomous blood, thick as ink and nearly solid, burst simultaneously from all seven orifices of Dugu Bo's face! Where the blood fell to the ground, it corroded the rock into a three-foot-deep pit!
The phantom of the Jade Phosphorous Serpent Emperor let out one last mournful cry toward the sky, then dissipated with a roar.
Dugu Bo opened his eyes.
Those eyes, which had been jade-green vertical slits for decades, had finally returned to a normal brown. Though still aged and clouded, they now held a trace of clarity and vitality.
He rose slowly, feeling an unprecedented lightness within his body. Decades of torment, washed away in a single moment!
"Ha... hahahaha!"
His laughter rose from low to thunderous, finally turning into a long roar toward the heavens. The roar echoed through the Sunset Forest, startling countless birds into flight.
Then, a powerful wave of soul power erupted from his body!
Level ninety-one, level ninety-two, level ninety-three!
With the accumulated poison cleansed and the baptism of the Ice and Fire Yin Yang Well's energy, this old poison master's cultivation broke through three levels in one go, reaching the rank of a Level Ninety-three Titled Douluo!
"Good! Good! Good!" Dugu Bo shouted three praises, slapping Yu Tiancheng heavily on the shoulder. "Yu boy, from this day on, you are the benefactor of me, Dugu Bo! This debt of gratitude, this old man will remember for life!"
Yu Tiancheng staggered from the slap and smiled wryly. "Senior, you flatter me."
"Not at all!" Dugu Bo said seriously. "This old man's life was given by you, and Yan'er's life was also saved by you. From today onward, the medicinal herbs of the Ice and Fire Yin Yang Well are yours to take as you please!"
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