The fissures at the bottom of the river were pitch black, but today’s Su Yu was not like before. With his strength now formidable, his vision could penetrate a certain range.

Plus, with Ao Run’s strength being significant, having the Vast Sea as a trump card, there was no need for caution, and they rapidly descended at great speed.

With one breath, they dived about two to three thousand meters, passing the mud layers into the rock strata. Below, the stone walls were all solid rock, occasionally seeing plants growing amidst the rocks and some unrecognized Spiritual Medicine.

The Spiritual Medicine that could grow in such an environment couldn’t possibly be low-grade, so he thought he might as well dig them up first.

With one breath, they continued diving seven to eight thousand meters further. Su Yu suddenly saw a massive shadow glide through the pitch-black abyss; with a glimpse, it was at level 220, vaguely sighting gray scales, the shape was long but neither dragon nor flood dragon, seeming more like some kind of serpent.

Fortunately, they had restrained their aura, so the creature did not notice them.

More than an hour later, they had dived more than a hundred thousand meters in one go. The water pressure was incredibly intense; even the level 150 Celestial Ghost transformation could barely withstand it, about to revert to its true form.

"Wait a moment."

The two of them and the flood dragon stopped at a certain point, and Su Yu smoothly opened the Sea Suppressing Realm Gate and slipped inside.

"I need to level up."

He opened the panel, his gaze falling on the Celestial Ghost Transformation, and with a thought, he invested a massive amount of cultivation points and Dao Foundation into it, with the Transformation Skill level rising rapidly.

An hour later, after consuming 200 billion cultivation points and 140,000 Dao Foundation, the Celestial Ghost Transformation was upgraded to level 160.

After a brief rest, he continued to improve.

Consuming 300 billion cultivation points and 200,000 Dao Foundation, the Celestial Ghost Transformation was upgraded to level 170.

"Again."

Once more, consuming 500 billion cultivation points and 300,000 Dao Foundation, the Celestial Ghost Transformation was upgraded to level 180.

Celestial Ghost Transformation Skill (Exquisite): Level 180, Dao Foundation Method, can transform into a Celestial Ghost.

The Celestial Ghost’s five life forms excel at Five Elements Flying Escape Skill, seamlessly changing between the real and illusory, with immense strength, Qi and Blood at 3.4 million, Mana at 340,000, body at 44,000, strength at 70,000, speed at 31,000 kilometers per hour.

Abilities: Celestial Ghost Body, Transmutation between reality and illusion, seamless change, Five Elements Thunder Skill, Five Elements Escape Skill, Five Elements Forbidden Skill, Five Elements Divine Gang, Body Transformation into Five Elements.

"The consumption of cultivation points and Dao Foundation is truly staggering."

That’s why masters above Loose Immortals rarely pursue dual cultivation, the consumption of cultivation points and Dao Foundation is simply too great, especially for those who primarily cultivate the Qi Refining Heart Skill at the pinnacle or supreme grade, just upgrading the Qi Refining Heart Skill is challenging enough, let alone upgrading several forbidden techniques and Divine Techniques, it’s completely unsustainable.

At this level, combat relies mainly on a few methods derived from the Qi Refining Heart Skill, besides using flying swords, treasures, and Dao Foundation. One might also practice a Thunder Skill, a forbidden technique, and a Divine Technique, at most two to three types.

As for Su Yu, he has now determined that his main focus is on this Celestial Ghost Transformation. He’s still undecided on whether to continue upgrading the Hundred Eyes Divine Light.

After finishing the upgrade, Su Yu exited the Sea Suppressing Realm. The overwhelming pressure he felt before disappeared without a trace, and he could continue descending.

However, to his speechless dismay, after this descent of not even two thousand meters, he discovered that the fissure had already reached its end.

Ao Run assessed the direction and led him to swim in one of the directions.

The water pressure on this underground level had reached an unbelievable degree, with all around being bare stones and tiny fissures; the only unique aspect was that many unknown luminous gemstones illuminated the surrounding stone walls.

As they passed those tiny fissures, Su Yu’s powerful senses vaguely perceived something hidden within them.

They swam ten kilometers or so, and two men and a flood dragon arrived at a colossal fissure ahead.

"It’s inside here."

At this moment, Qingchan, who had been silent all along, suddenly spoke:

"How beautiful!"

Su Yu took one look and saw that this fissure was surrounded by luminous gemstones like a kaleidoscope, extremely beautiful.

"Let’s go!"

Having come this far, they had to go down at least once.

Ao Run dove headfirst into the passage, and the two followed closely.

The passage posed no dangers, surrounded entirely by luminous gemstones, the surface extraordinarily smooth, likely polished smooth by passing Spirit Monsters. Two men and a flood dragon slid down, diving about ten thousand meters or so to reach the end of the passage.

"Wow!"

Beyond the passage, a vast underground world unfolded before Su Yu’s eyes, stretching endlessly.

Multicolored radiance illuminated the underground, filled with colorful underwater plants, with enormous Spirit Monsters swimming about. It looked no different from the underwater world outside.

Su Yu could hardly believe that such a vast underground world existed at least several hundred kilometers deep beneath the Blue Mountain.

He was stunned for a while before suddenly asking Ao Run:

"How did you escape from here originally?"

He remembered that Ao Run was just slightly over level 100 initially, an elite template, yet with that strength, he managed to escape from this underground world through river fissures swarming with terrifying creatures to reach the Yuanjiang River—truly astounding.

"Because at that time, I had the last Dragon Palace Talisman, which allowed me to drive away various demons to reach the Yuanjiang River."

"I see."

Su Yu nodded, his gaze shifting to the vast underground world below and asked:

"Is the ancient Teleportation Array there underground? How far is it from here?"

"There’s some distance."

"Let’s go, then."

Su Yu looked up at the spirit monsters swimming back and forth in the underwater world, thought for a moment, and decided not to transform back into a Celestial Ghost. He reached out and summoned the Divine Bow of the Sun, grasping the bowstring with his right hand and injected mana into it as he pulled, forming a glimmering arrow.

"Whoosh!"

The arrow broke through the air and hit a 185-level underwater monster fish, spanning over two hundred meters, a few kilometers away, instantly delivering a terrifying 2.08 million damage.

This thing is called an underwater monster fish, it’s an experience monster with a trash template, and its total health is only 12.3 million, with one arrow dealing 2.08 million.

As soon as he took action, Ao Run immediately transformed back into his true form, sweeping a torrent of Meridian Cold Tide from afar.

Qingchan pointed her finger, and two sword lights, not dazzling but piercing to the eye, flew out, wrapping around the underwater monster fish and twisting back and forth, causing dense waves of damage to jump up, each exceeding a hundred thousand.

After three consecutive arrows, the underwater monster fish turned belly up.

The sword light rolled up the spoils, which turned out to be a pile of scales and a skeleton.

"The experience is pretty good."

Su Yu said to Qingchan:

"Since we’re here, let’s level up as we go."

Qingchan smiled sweetly:

"Sure."

Su Yu raised the divine bow and aimed at a nearby experience monster, pulling the bowstring.

This place indeed is rare and suitable for him to level up. At a glance, there were hundreds of experience monsters, with the lowest level being 150 and often reaching 180, 190, even occasionally seeing colossal creatures over level 200.

What surprised Su Yu was that these colossal creatures over level 200 weren’t all bosses; some were experience monsters.

Yes, experience monsters over level 200; this was his first time seeing them.

Su Yu and Qingchan cooperated well. He drew the bow to engage monsters from afar, Ao Run intercepted, and Qingchan wielded two tier ten flying swords for output.

The Divine Bow of the Sun is a pure attack-type tier ten treasure. Its power can’t match the Divine Axe of Heaven Splitter, but it has a long attack range, low mana consumption, and a short cooldown, requiring just one second to charge.

Aiming from over ten kilometers away, with Ao Run intercepting and Qingchan assisting with output, experience monsters below level 200 often died halfway before reaching them.

After killing a dozen, Su Yu started to draw more, attracting several at once.

After brushing a few waves and finding the rhythm, he attracted a dozen, twenty, forty, and eventually, with growing boldness, drew over a hundred at once.

With Ao Run blocking upfront, these experience monsters couldn’t get close to them.

"The experience is good, let’s grind here for a while longer."

Qingchan’s eyes were all on him, nodding and saying:

"As long as I’m with you, anywhere is fine."

Su Yu hugged her waist and kissed her deeply.

Then they stayed there, focusing on grinding, slowly working their way through.

Experience monsters below level 200 couldn’t withstand their burst; no matter the numbers, it only took a little more effort. Only those experience monsters over level 200 took a bit more effort.

Their levels were high, with a minimum health of forty to fifty million, high defense, and crucially, the realm provided a breakthrough defense resistance bonus.

The Divine Bow of the Sun’s penetration +10 and Qingchan’s tier ten flying sword’s armor penetration +10 could cause full damage on monsters below level 200, but for those above level 200, even experience monsters were significantly weakened, only inflicting half the effect.

But still, with Ao Run blocking upfront, even experience monsters over level 200 were doomed, just harder to kill.

Their trio combination was so powerful that even in this high-level underground spirit monster zone, they were unstoppable, engaging in relentless slaughter for a month and a half, killing through the upper section of the underground space to the bottom, then adjusting direction and heading towards the ancient teleportation array.

"Oh?"

"What’s that? A Spirit Vein?"

The trio flew over an underwater mountain range and saw a hole with a diameter of over two hundred meters between the underwater canyons ahead, from which dense spiritual qi had turned solid and erupted like a volcano.

Above the hole, a few hundred meters away, a giant palace hung, radiant light bursting from it.

"There’s a celestial mansion in this underground world?"

Su Yu immediately became interested, waving his hand and said:

"Let’s go have a look."

Whether the celestial mansion had an owner wasn’t clear; this underwater canyon was empty at a glance, with only various remnants and broken bones piled near the celestial mansion.

"I wonder if this celestial mansion is unowned; if it is..."

Su Yu’s voice paused less than a kilometer into flight, as his expression of joy suddenly disappeared.

"Whoa crap!"

As he approached a certain distance to the celestial mansion, his powerful perception activated, revealing the radiance-emitting celestial mansion ahead to twist, soon shattering like a bubble, replaced by a colossal, 2000-meter white conch spirit with an extraordinary template, level 245, entrenched on the spirit vein.

This giant conch was snow white all over; its shell resembled a mountain, with exposed soft conch flesh also white, its body and several tentacles spread out suspended above the spirit vein, ravenously absorbing the spiritual qi erupting from the crevice.