Gradually, a miniature energy vortex formed inside Yu Yan, spreading outward and slowly influencing the world around him. A Taiji-like phantom appeared beside him, pulling the Ice and Fire Yin Yang Well into a similar pattern.
Within that energy, the Ice and Fire Twin Fish themselves were undergoing obvious changes.
The Ice Fish's scales grew even more crystalline, their color deepening to a rich, dark blue, as though carved from the purest ice crystal. On those scales, faint patterns resembling the Octagonal Mysterious Ice Grass now surfaced.
The Ice Fish's body lengthened once more; its fins and tail became broader and sharper, greatly enhancing its agility. If Martial Soul Possession were used, these changes would feed back into Yu Yan's own body.
Most crucially, the cold the Ice Fish released surged to new heights—already fierce, the chill now climbed several more levels and kept intensifying.
The fire fish shifted from orange-red to the deep crimson of the blazing apricot cactus, flame patterns like those of the herb flickering across its body. With every flash, the fish's blaze grew stronger without pause.
Sun rose and moon set; in the blink of an eye a full day passed. Having absorbed every trace of medicinal power, Yu Yan, still floating in the Ice and Fire Yin Yang Well, opened his eyes.
With his new Ice-and-Fire immune Physique, the Ice and Fire Yin Yang Well felt to him no different from an ordinary hot spring.
A body invulnerable to all poisons—more precisely, unless a toxin could completely surpass the combined toxicity of the two Immortal Herbs, any poison entering his system would be swallowed like a nourishing tonic.
As the Ice and Fire Immortal Herbs interwove, Yu Yan felt his Physique strengthened inside and out; he was certain the age limit of his third spirit ring could rise yet again.
After confirming these basics, he broke the surface, lifted a hand, and summoned his Ice and Fire Twin Fish Martial Soul.
Over that single day and night, the Ice and Fire Twin Fish had changed beyond recognition.
First, both fish had reached a full meter in length; size is a symbol of power—the bigger the fish, the greater the strength, a simple truth.
Second, Yu Yan could now feel extreme cold and extreme heat radiating from them; the sensation once reserved for standing near the Ice and Fire Yin Yang Well now emanated from the fish themselves, showing their two attributes had reached, or neared, ultimate extremes.
Lastly, he sensed that the medicinal power of the Octagonal Mysterious Ice Grass and the blazing apricot cactus was not yet spent; intertwined, it formed a miniature Ice and Fire Yin Yang Well inside him, waiting to be digested slowly.
Besides these benefits, the fact that his spirit power had reached rank 30, his Spirit Abilities had grown markedly stronger, and his full-force strikes now carried both chill and flame toxins felt almost trivial.
An hour later, fully accustomed to his changes, Yu Yan stood on the bank, drew a deep breath, and leapt once more into the Ice and Fire Yin Yang Well.
The Ice and Fire Yin Yang Well had been born because, ten thousand zhang beneath this spot, lay the corpses of the Water and Fire Dragon Kings—two of the nine great Dragon Kings.
Having gained immunity to water and fire and no longer hindered by the well's environment, Yu Yan wanted to see how deep he could go.
With the Ice and Fire Twin Fish Martial Soul Possession active, the two fish circled him, letting him move underwater even more nimbly—his speed now a third faster than on land.
Ten zhang… one hundred… one thousand. At a thousand zhang, even with Ice-Fire immunity, he could once again feel their temperatures.
Another five hundred zhang and he knew he had reached his limit; push farther and he would die within the Ice and Fire Yin Yang Well.
He carved a mark on the cliff to record the depth he had reached, then shot upward toward the surface.
Back on shore and dressed, he judged the time of day, then headed to the outer edge of the Ice and Fire Yin Yang Well. Following the Qi-boosting prescription he had found earlier, he gathered the lowest-year herbs he could spot and began brewing the secret medicine to suppress Senior Dugu's Jade Phosphor Serpent Poison.
A body immune to all poisons—more precisely, unless a toxin can surpass the combined virulence of the two Immortal Herbs, any poison that enters Yu Yan's body is simply swallowed like a tonic.
As the medicinal powers of the Ice and Fire Immortal Herbs interwove, Yu Yan felt his physical quality strengthen from the inside out; he was certain the age limit of his third spirit ring could rise again.
After confirming these basics, Yu Yan surfaced, lifted a hand, and summoned his Ice and Fire Twin Fish Martial Soul.
In the span of a day and night, the Ice and Fire Twin Fish had undergone earth-shaking change.
First, both fish had grown to a full meter in length; in their case, size equaled might—the bigger the fish, the stronger, plain and simple.
Second, Yu Yan could feel extreme cold and heat radiating from them; the sensation once reserved for standing near the Ice and Fire Yin Yang Well now belonged to the Ice and Fire Twin Fish themselves, proving their two attributes had reached—or neared—perfection.
Lastly, Yu Yan sensed that the medicinal strength of the Octagonal Mysterious Ice Grass and the blazing apricot cactus was far from spent; entwined, they formed a miniature Ice and Fire Yin Yang Well inside him, waiting to be slowly refined.
Besides these benefits, reaching spirit power level thirty, a marked boost in Spirit Ability might, and attacks laced with chilling or burning venom were almost trivial.
An hour later, fully adapted to his changes, Yu Yan stood on the bank, inhaled deeply, and dove once more into the Ice and Fire Yin Yang Well.
The Ice and Fire Yin Yang Well was born because, ten-thousand zhang beneath this spot, lay the corpses of the Water and Fire Dragon Kings—two of the nine great Dragon Kings.
Having gained immunity to water and fire and no longer affected by the well's environment, Yu Yan wanted a look below.
With the Ice and Fire Twin Fish Martial Soul Possession active, the twin fish circled him, letting him move nimbly underwater—his speed even a third faster than on land.
Ten zhang… a hundred… a thousand. At a thousand zhang, despite his immunity, he finally felt the well's biting cold and searing heat.
Another five-hundred zhang and he hit his limit; pushing farther would mean death within the Ice and Fire Yin Yang Well.
He carved a mark on the wall to record his depth, then kicked upward and shot toward the surface.
Back on shore and dressed, Yu Yan checked the sky, walked to the outer edge of the Ice and Fire Yin Yang Well, and—following the Qi-boosting prescription he'd found earlier—picked the lowest-year herbs to brew the secret medicine that would suppress Senior Dugu's Jade Phosphor Serpent Poison.
He ground every ingredient to powder, dripped in a few drops of his own blood, mixed it with clean water, and shaped the paste into pills.
The hardest part of brewing the secret medicine for Dugu Bo wasn't the process—it was finding low-year herbs; in a treasure-ground like the Ice and Fire Yin Yang Well, the plants were simply too superb. "Kid, is my medicine ready?"
Two mornings later, Dugu Bo appeared before Yu Yan right on time, forcing a stiff smile as he asked if the medicine was prepared.
"Senior Dugu, you actually look normal when you're not smiling."
Seeing that rigid, frightening grin, Yu Yan couldn't help reminding him to act natural.
"Boy, don't push your luck."
Dugu Bo, who'd meant to be nicer, instantly wiped away the smile and delivered an icy warning.
"Yes, Senior. These are the secret pills I refined. Swallow one and it will suppress your Jade Phosphor Serpent Poison to a degree, letting you slowly drive the toxin into a Spirit Bone for storage."
Handing over the pills, Yu Yan patiently explained the detox process again.
He never asked the stupid question of whether Dugu Bo owned a suitable Spirit Bone.
How could a Titled Douluo not have one?
Medicine and poison share the same root; Dugu Bo raised the pill to his nose, confirmed it held no harmful agents, and identified its rough composition.
Knowing its makeup, he frowned at Yu Yan. "Yu Yan Kid, this thing can really suppress my Jade Phosphor Serpent Poison?"
"You'll know once you eat it."
Too lazy to answer, Yu Yan simply urged him to swallow the pill.
After several more inspections to be sure there was no trap, Dugu Bo gave a silent order to the nine-section jadeite serpent in his sleeve, then popped the pill into his mouth.
Tasting and analyzing it, he confirmed again: the pill merely replenished Qi and blood, plus some harmless, unknown herbs.
This thing can actually—before he could finish, the medicine spread, and he felt his Jade Phosphor Serpent Poison distinctly suppressed.
It actually works—how is that possible?
[?!]
Startled, Dugu Bo quickly steadied his mind and slowly pushed a small amount of the poison toward a poison-attribute Spirit Beast's Spirit Bone in his body.
Once the toxin was sealed in the bone and he sensed the poison truly lessen, the thrilled Dugu Bo rose and roared to the sky in joy.