Yu Tianheng did not reply directly, but instead asked Dugu Bo, "In your opinion, senior, which side should I choose?"
Before Dugu Bo could speak, Dugu Yan said, "For a normal Soul Master, the age of their Fifth Soul Ring is around ten thousand years. Therefore, they would choose a Crocodile Dragon with a cultivation level of ten thousand years, as this would be safer to absorb."
"But Tian Heng, your fourth Soul Ring is Ten-Thousand-Year Soul Beast, so naturally you should choose a fifth Tian Heng Fifth Soul Ring with an even higher age. Therefore, I think you will choose a Crocodile Dragon with an age of around twenty thousand years. Am I right?" Dugu Yan asked.
Yu Tianheng smiled slightly, " Yanyan is right, but I won't choose either of these two Soul Beast. My real target is that Crocodile Dragon leader."
Upon hearing this, Dugu Yan appeared slightly surprised, while Dugu Bo frowned. "I've examined that Crocodile Dragon leader. Its age is at least 35,000 years, and it's even very likely to be 40,000 years. To absorb Soul Ring from a Soul Beast of this level, one's cultivation level must be at least level 60, or even level 70. You're only level 50 right now, yet you want to absorb such a Soul Ring. Isn't that a bit too ambitious?"
Dugu Bo knew that Yu Tianheng had a secret, and it was even very likely that he had cultivated a cultivation technique similar to the " Hundred Poisons Mysterious Skill," otherwise he could not have such a terrifying cultivation speed.
The reason why he was able to have Ten Thousand Year Soul Ring at level 40 should also be due to this.
Therefore, if Yu Tianheng intends to choose Soul Beast with a higher age as his Fifth Soul Ring, Dugu Bo can understand.
However, this Crocodile Dragon leader is too old, which is really inappropriate.
Upon hearing this, Yu Tianheng did not offer any further explanation, but simply said, "My mind is made up, please do not stop me, senior!"
Seeing Yu Tianheng's unwavering tone, Dugu stopped trying to dissuade him. "In that case, be careful."
"Also, do you need my help?"
Yu Tianheng nodded. "Then I'll trouble you, senior, to use your poison skills to incapacitate this entire Crocodile Dragon clan. I don't need to kill them all, but at least render them incapacitated so I can make my move and kill the Crocodile Dragon leader."
"Alright!" Dugu Bo immediately took action, waving his sleeve, and the emerald green poisonous mist instantly spread out, soon enveloping the entire underground river.
It was Dugu Bo's specialty, the Jade Phosphor Serpent Emperor Poison. The moment they came into contact with the poisonous mist, the Crocodile Dragon with lower cultivation levels immediately foamed at the mouth and fainted, while those with higher cultivation levels swayed and became weak in the limbs.
The only ones still able to move were the three Crocodile Dragon, whose cultivation had reached ten thousand years.
They realized something was wrong and tried to escape, but it was too late.
Dugu Bo leaped up and appeared behind them, releasing nine Soul Ring. Instantly, an overwhelming pressure swept over them, blocking the three Crocodile Dragon ' escape route.
Seeing that there was no way to avoid it, the three Crocodile Dragon tried to charge straight at Dugu Bo, knock him away, and find a way to survive.
Seeing this, Dugu Bo smiled disdainfully, his green hair suddenly stood on end, and he directly unleashed his Seventh Soul Skill, the Jade Phosphor Serpent Emperor Avatar.
The moment it was activated, the stalactites on the dome of the underground river were shaken and shattered by the terrifying pressure. A gigantic, azure-scaled serpent, its shadow covering the sky, solidified behind Dugu Bo. Its eyes gleamed with a sinister green light, and the reflection of its scales shone with a chilling light. The sheer imposing aura of its coiled form made the flow of the entire underground river seem to stand still.
"Taste my snake tail!" Amidst Dugu Bo's hoarse laughter, the phantom of the Jade Phosphor Serpent Emperor suddenly swung its long tail.
The tail tip, carrying immense force and dense poisonous mist, ripped through the water like a green lightning bolt—the two ancient Crocodile Dragon, which were just opening their mouths to spew out ice spikes, didn't even have time to react before being struck solidly in the side by the tail tip.
"Bang! Bang!" Two muffled sounds, like the beating of drums, instantly caused spiderweb-like cracks to appear on the Crocodile Dragon's iron-black scales, and the fierce light in its amber pupils suddenly dissipated.
Their massive bodies crashed into the rock wall like broken kites, shattering stalactites that mingled with the dark river water. The two ten-thousand-year-old Soul Beast, under the power of the Jade Phosphor Serpent Emperor Avatar, had their eyes distorted and mouths crooked, floating belly-up on the water's surface, unconscious before they could even struggle.
The poisonous mist seeped into their scales, creating eerie bubbles at the wounds, and even the surrounding water was tinged with a deathly turquoise.
Seeing his two underlings so easily defeated by this powerful human, the Crocodile Dragon leader quickly turned around and fled towards Yu Tianheng's location.
Compared to this powerful human, the auras of the two people behind him were much weaker, and he might not be unable to contend with them.
Seeing the Crocodile Dragon turn around, Dugu Bo was about to intervene, but then he heard Yu Tianheng say, "There's no need for you to do anything, senior. I will kill the Crocodile Dragon. You only need to keep an eye on Yanyan."
Dugu Bo nodded, then flashed and appeared behind Dugu Yan, taking her away from the battlefield.
Facing the menacing Crocodile Dragon, Yu Tianheng's body suddenly surged with blue Thunder.
The black fourth Soul Ring rose, radiating a brilliant light.
" Thunder Dragon Head!"
With a loud shout from Yu Tianheng.
He suddenly waved his hand forward, and a giant dragon head formed from raging lightning roared out, crashing into the Crocodile Dragon with a deafening roar that tore through the air.
The Thunder Dragon Head slammed into the Crocodile Dragon's hard scales. Amidst the crackling lightning, the scales shattered inch by inch, and blood mixed with the smell of burning splattered out.
The Crocodile Dragon let out a painful roar, its massive body being forced back several steps, yet it still swung its long tail, its scarlet eyes gleaming even more fiercely—its 35,000 years of cultivation had made its physique extremely powerful. Although this Thunder Dragon Head had torn through its defenses, it had failed to strike any vital points, and the fierce battle was clearly not over yet.
Seeing this, Yu Tianheng thought to himself: As expected of the Crocodile Dragon, which is known for its thick skin and tough flesh, its defensive power is indeed amazing.
Even my Ten-Thousand-Year Soul Skill couldn't severely injure it.
Looks like I'll have to use some real skills.
On the other side, Dugu Yan, who was watching from a distance, saw that the Crocodile Dragon became even more ferocious after being injured, while Yu Tianheng's breath was slightly sluggish due to the consumption of his Soul Skill, and his heart instantly jumped into his throat.
She tugged at her grandfather Dugu Bo's sleeve, stamping her feet anxiously, "Grandpa! Hurry and make your move! That ten-thousand-year-old Crocodile Dragon is about to pounce!"
Dugu Bo leisurely stroked his beard, his aged face showing no sign of tension.
He waved his hand, his emerald green eyes fixed on Yu Tianheng's tall and imposing figure in the arena, a meaningful smile playing on his lips, "What's the rush, girl? That kid Yu Tianheng still has some trump cards he hasn't used yet."
Dugu Yan, however, did not believe it. "Grandpa, what nonsense are you talking about! Tian Heng even used his most powerful Fourth Soul Skill, but he still couldn't kill this Crocodile Dragon. This shows that its defense is amazing. So what can Tian Heng do?"
Dugu Bo said helplessly, "You underestimate Yu Tianheng. His strength is far more than that. Just watch with peace of mind. If anything unexpected happens, Grandpa will take action."