The Ice and Fire Yin Yang Well was both a treasured land where spiritual energy gathered and a deadly place shrouded in poisonous miasma.
The miasma here was unique. Even Titled Douluo who specialized in poison, like Dugu Bo, didn't dare stay here for too long.
An ordinary Soul Master who came unprepared would be done for before even reaching the mountain; they'd be finished as soon as they neared the valley.
The first time Ling Feng came here, he'd prepared antidotes in advance. Only then could he last here for a while.
So he had no reason to worry that anyone else would discover this place.
"So many precious herbs!" Bibi Dong exclaimed, stunned by the herbs growing near the Ice and Fire Yin Yang Well.
Even in the medicinal gardens of Spirit City, Bibi Dong had never seen so many precious herbs that had grown for so long.
Because the miasma suppressed them, these precious herbs could hardly become Soul Beasts, even if they had grown for a sufficient number of years.
"There are precious herbs, but also poisonous ones. Don't touch anything carelessly, or you might get poisoned!" Ling Feng warned her.
He was immune to all poisons, but Bibi Dong wasn't. Even after taking his blood, she could only resist the miasma here.
If Bibi Dong carelessly touched those thousand-year or ten-thousand-year poisonous plants, she definitely wouldn't be able to withstand their toxins.
In truth, Ling Feng didn't recognize those poisonous plants either. But since he was immune to all poisons, he could test them and sort them into different categories.
"Okay, I won't touch anything carelessly!" Bibi Dong said.
In fact, Bibi Dong was already very satisfied that Ling Feng was willing to bring her here.
A secret treasure land like this was incredibly precious to any Soul Master.
Even if Soul Masters couldn't use these precious herbs and poisonous plants, they could sell them for money and exchange the proceeds for other cultivation resources.
Ling Feng first picked every Immortal Herb he recognized, placed them in containers he'd prepared beforehand, and stowed them in his Soul Tool.
Aside from the Lovesick Heartbreak Red, which was difficult to collect, the other Immortal Herbs could all be picked.
After collecting the Immortal Herbs, Ling Feng began gathering the precious herbs and poisonous plants that had grown for more than ten thousand years.
If a plant didn't poison him, it was a precious herb. If it did poison him, but the small Ice and Fire Yin Yang Well inside his body neutralized the poison, then it was a poisonous plant.
Ling Feng stored the poisonous plants and precious herbs separately, planning to study them at his leisure after returning.
Before long, Ling Feng had picked all the precious herbs that had grown for more than ten thousand years.
He left the herbs that had grown for fewer than ten thousand years behind, effectively leaving a seed stock.
Only after he'd finished picking did Ling Feng walk up to a pitch-black stone.
This stone was called Wu Jue Black Stone. It was black all over and incredibly heavy.
Growing on the bare stone was a large flower with no leaves, only a single slender, pure-white stem.
The flower was about the size of a palm and resembled a white peony. Its petals had the sheen and texture of white jade.
Scattered blood-red patches on the petals made the flower seem even more uncanny.
This was the Lovesick Heartbreak Red, the king of flowers and the finest of all Immortal Herbs.
It gave off a faint, elegant fragrance. Growing all alone on the black stone, it stood apart from the world, as if waiting for its beloved to return.
"Bibi Dong, come over here!" Ling Feng called.
"What is it?" Bibi Dong asked curiously as she walked over to Ling Feng. Then she saw the flower in front of him.
Seeing how carefully Ling Feng treated the flower, she knew it was no ordinary bloom.
"Bibi Dong, this flower is called the Lovesick Heartbreak Red. It's the king of flowers, an Immortal Herb among flowers."
"Eating it can raise your Soul Power by ten levels, and it can even give you one chance to bring the dead back to life and restore flesh to bare bones."
"No matter how badly you're injured, as long as you still have a breath left, this flower can save you."
Hearing Ling Feng describe the flower, Bibi Dong was astonished.
Even she would need two or three years of cultivation to gain ten levels of Soul Power.
Bibi Dong trusted Ling Feng deeply. Although the Lovesick Heartbreak Red was far beyond anything she knew, she believed it was real.
"If the Lovesick Heartbreak Red is that powerful, Ling Feng, you should eat it! Then your Soul Power would catch up to mine, wouldn't it?"
Bibi Dong urged Ling Feng to eat the Lovesick Heartbreak Red.
But Ling Feng shook his head. "Bibi Dong, I've already taken an Immortal Herb. Eating another would just be a waste."
"This Immortal Herb was prepared for you."
"We're going to the Capital of Slaughter to train. Your Soul Power can't be too low!"
"For me?" Bibi Dong was touched. Ling Feng was actually willing to give her such a miraculous Immortal Herb?
Ling Feng nodded. "That's right. Go on, try it."
"This Immortal Herb is sentient. You have to make it acknowledge you as its master before you can absorb it."
"If you forcefully pick it, its medicinal power will dissipate and it'll lose all its effects," Ling Feng warned.
"So this is what an Immortal Herb is? No wonder it has such astonishing effects," Bibi Dong marveled.
"Then how do I get it to acknowledge me as its master?"
Ling Feng smiled. "Picture me in your mind, then force out a drop of heart's blood and let it fall on the flower."
"If you truly love me, then this king of flowers will recognize you as its master!"
Bibi Dong thought Ling Feng was testing her. She hurriedly declared, "Of course I truly love you!"
"Just wait. I'll make this king of flowers recognize me as its master!" Bibi Dong said.
She gazed at Ling Feng tenderly, imagining a future with him. Then she used her Soul Power to force out a mouthful of heart's blood and spat it onto the petals.
The heart's blood looked like the red spots on the petals, making the Immortal Herb seem even more uncanny.
The flower of the Lovesick Heartbreak Red swayed. Its roots detached from the Black Absolute Stone on their own, and it slowly drifted down.
Bibi Dong immediately sensed a mysterious connection between herself and the flower.
"So the way to make it acknowledge me as its master really works? I've actually become the flower's master?" Bibi Dong thought.
She picked up the Lovesick Heartbreak Red and waved it in front of Ling Feng.
"Ling Feng, look, I did it! You should believe now that I truly love you, right?"
Ling Feng nodded. "Mm. I've always believed you. Otherwise, I wouldn't have let you pick this flower."
"Go ahead and eat the Immortal Herb. I'll protect you while you absorb it!"
"This Immortal Herb can also strengthen your body, which will help you absorb your fifth Soul Ring!" Ling Feng said.
In Bibi Dong's eyes, the flower was like a keepsake marking her love for Ling Feng, and she couldn't bear to eat it.
But thinking of their future together, she decided to take the Immortal Herb and improve her strength as quickly as possible.
"All right, I'll eat it now!" Bibi Dong said.
She'd taken Ling Feng's blood, so she wasn't afraid of the poisonous miasma here. She found a stone platform, sat down, and took the Immortal Herb.
Ling Feng went over to the pool and took out several specially made Yin Yang Jade Bottles.
These jade bottles could hold Cold Spring water on one side and Sun Spring water on the other, keeping their Yin and Yang in balance so the bottles wouldn't crack.
At a critical moment, they could be used as a secret weapon.
If he could get this stuff inside someone's body, even a Hundred-Thousand-Year Soul Beast wouldn't be able to withstand it, let alone any other enemy.