Of course, this was just Ye Yu's speculation.
But if he wanted to verify it, it was actually quite simple.
He just needed to summon his Blue Silver Jade Tree Martial Soul, split off a sub-body, and have it extend deep underground—over ten thousand meters down—to reach the underground cave at the very bottom of the Ice and Fire Yin Yang Well, where the corpse of the Ice and Fire Dragon King lay.
Because he had refined his body using the Octagonal Mysterious Ice Grass and Infernal Delicate Apricot, achieving dual-polarity body tempering, not only had Ye Yu's own body acquired immunity to extreme fire and ice, but so had his Blue Silver Jade Tree Martial Soul—and its sub-bodies as well.
So, if a sub-body of the Blue Silver Jade Tree could bury its roots deep into the earth and reach the underground cave where the corpse of the Ice and Fire Dragon King lay, and withstand the extremely cold Yin Spring and scorching Yang Spring closest to that corpse—then logically, Ye Yu's body should be able to handle it too.
"Six of them?"
To Dugu Bo's surprise, there were actually six Dragon Blood Grasses growing around the Ice and Fire Yin Yang Well.
He was stunned for a moment.
Thinking back, he realized… that seemed right. He had indeed seen more than one of this herb around the Ice and Fire Yin Yang Well.
At last, Dugu Bo accepted the jade box that Ye Yu handed him.
"Xiao Yu, how should this Dragon Blood Grass be consumed?" he asked curiously as he looked at the plant inside, shaped like a delicate green mini-dragon.
Although he was a renowned master of poison and herbalism, Dugu Bo still didn't recognize some rare immortal herbs, including top-tier ones like Nine-Grade Purple Ganoderma, Blood-Penetrating Dragon Ginseng, and this Dragon Blood Grass.
"It's easy," Ye Yu smiled. "Grandpa, just eat the whole thing like ginseng—chew and swallow."
Hearing this, Dugu Bo didn't hesitate. He picked up the Dragon Blood Grass and popped it into his mouth, chewed a few times, then swallowed it down.
Then he immediately sat cross-legged and began refining it through meditation.
A moment later, a brilliant green light burst forth from his body.
At the same time, his Jade Phosphor Serpent Emperor Martial Soul appeared behind him. Beneath him, two yellow, two purple, and five black Spirit Rings rose up—nine in total—circling his body.
Under the medicinal effect of the Dragon Blood Grass, his Martial Soul began to change.
The emerald glow flowing across the Serpent Emperor's body became more intense.
With every pulse of light, the Martial Soul underwent a transformation.
Its body grew longer and larger.
The green scales expanded, deepened in color, and became more crystalline.
The triangular snake head took on a more regal, imposing, and fearsome look. Two horn-like protrusions emerged on its head, and even its belly showed signs of transformation.
Eventually, the Jade Phosphor Serpent Emperor Martial Soul completely evolved into a Jade Phosphor Poison Dragon Martial Soul—a massive draconic beast with an inky green body, a fearsome dragon head, and sharp claws beneath its belly.
And with the evolution of his Martial Soul, Dugu Bo's cultivation also instantly broke through.
Back when he first consumed the Nine-Grade Purple Ganoderma, his rank had risen from Rank 91 Titled Douluo to Rank 92.
Later, through years of arduous cultivation under the herb's lingering effects, he had advanced to Rank 93.
Then two years ago, Ye Yu had retrieved the External Spirit Bone: Eight Spider Lances from Tang San and gifted it to Dugu Bo.
After fusing it, Dugu Bo's rank reached Rank 94, and he finally resolved the chronic phosphor poison plaguing his body.
Now, after two more years of hard cultivation—and with the Dragon Blood Grass evolving his Martial Soul—his cultivation had finally reached Rank 95 Titled Douluo.
Just one more step, and he would ascend to the next tier: Super Douluo!
This made Dugu Bo extremely excited.
"I broke through! I finally broke through again!"
"That damned Old Chrysanthemum… now I've caught up to you!"
"Just wait!"
"One day, I'll challenge you and beat you fair and square!"
After venting his excitement, Dugu Bo stroked his white beard, standing tall, and urged Ye Yu:
"Hurry up and give one to Yanyan too—make her happy."
Ye Yu chuckled and nodded.
With a smile, he found Dugu Yan and handed her a Dragon Blood Grass.
"Yanyan, this Dragon Blood Grass can evolve your Jade Phosphor Serpent Martial Soul. Hurry and consume it."
After consuming it, Dugu Yan also sat cross-legged and began refining the herb through meditation.
Behind her, her Jade Phosphor Serpent Martial Soul emerged, and beneath her, five Spirit Rings rose: two yellow, two purple, one black.
Under the influence of the Dragon Blood Grass, her Martial Soul began to evolve—and her rank rose from Rank 52 Spirit King to Rank 55!
Dugu Yan was overjoyed. Leaping up, she threw herself into Ye Yu's arms and gave him a kiss.
"Ah Yu, thank you!"
"What are you thanking me for?" Ye Yu said with a laugh.
"There's no need for that between us."
Knowing that her grandfather's Martial Soul had also evolved, and with her deep understanding of Dugu Bo's habits, Dugu Yan was sure he had gone out to test his Spirit Abilities.
At that moment, she thought of something.
As Ye Yu's official girlfriend, she had hesitated too long.
Because of various concerns, she'd missed her chance—and been overtaken by Zhu Zhuqing and Ning Rongrong!
Now, sensing her grandfather was out of the house, Dugu Yan finally steeled her resolve.
She hugged Ye Yu tightly, bit her lip, cheeks flushed with nervousness, and whispered:
"Ah Yu… don't leave tonight… okay?"
Her emerald eyes shimmered with emotion as she gazed at him.
That night, Ye Yu didn't leave.
Even the moon shyly hid behind the clouds.
The next morning.
Because Ye Yu's body was so overwhelmingly strong…
After a "friendly spar" with the newly evolved Dugu Yan, she ended up with some minor injuries.
So that day, Ye Yu could only escort Dugu Yan to Heaven Dou Imperial Academy by carriage.
"Brother Ye Yu, why are we taking a carriage today?" Zhu Zhuqing asked curiously.
Ye Yu gave a light cough and replied awkwardly:
"Yesterday, I found a herb that could help Yanyan evolve her Martial Soul."
"Her Martial Soul did evolve, and… we had a little spar afterward."
"I accidentally hurt her a bit. So today, we'll take a carriage."
"Oh~"
Zhu Zhuqing nodded.
But when she saw Dugu Yan walking stiffly and blushing deeply…
As someone who had been through it herself, she instantly understood what really happened.
The corners of her lips curved upward in a knowing smile—but she said nothing.