Longevity through Upgrading Buildings Chapter 808 - 336: Miracle Treasure—Lightning Chaser

Yin Corpse Demon Fire!

This marked Ji Yuan's inaugural use of the Yin Corpse Demon Fire in actual combat, leaving him uncertain of its true potency.

Consequently, he unleashed the entirety of the Yin Corpse Demon Fire in a single, forceful breath.

The sheer density of the flames far exceeded any prior testing within the Cave Mansion.

As the Yin Corpse Demon Fire descended, Ji Yuan observed with surprise that even the Yin Ghost Array could not withstand its onslaught. Despite his most devoted efforts to maintain control, the array inadvertently fell victim to friendly fire.

He swiftly retrieved the Array Flag, intent on protecting himself from the inferno.

However, the Tier Three long-necked Serpent situated at the heart of the fiery expanse was not so fortunate.

This very creature, which had previously multiplied into four to assail Ji Yuan, now found itself engulfed by the burning Yin Corpse Demon Fire...

The three serpent heads progressively dissolved into Spiritual Qi, vanishing into nothingness.

Illusory apparitions.

Yet, during the recent onslaught, these phantom heads had possessed a tangibility so convincing, they appeared as the genuine article; Ji Yuan himself had been unable to discern the true serpent from its projections.

But in this moment...

The single remaining entity, the authentic long-necked Serpent, writhed and bellowed ceaselessly within the searing embrace of the Yin Corpse Demon Fire.

A barrier of water-blue light enshrouded its entire form.

Nevertheless, this protective shield proved ephemeral against the Demon Fire, dissipating in mere breaths.

It then fractured into scattered Spiritual Light.

Immediately thereafter, the long-necked Serpent expelled torrents of seawater, yet the Yin Corpse Demon Fire, inherently capable of burning within water, felt no apprehension.

On the contrary, the surging seawater only intensified the furious conflagration of the Yin Corpse Demon Fire.

The Demon Fire raged, leaving no sanctuary.

Within the span of a few breaths, the Serpent's four claws and abdomen were ablaze, the Demon Fire commencing its consumption of its flesh.

"Roar—"

The long-necked Serpent's cries morphed into agonizing wails.

Its body thrashed convulsively; it even perceived Ji Yuan observing from a distance. The desire for retribution surged, but ensnared by the Demon Fire, escape was impossible, let alone retaliation.

Ultimately, it managed only a few more futile struggles.

With its limbs aflame, standing became an impossibility, forcing it into a helpless roll upon the ground.

After a few more moments, it could no longer even right itself.

Lying prone, swathes of its body revealed stark white bone.

Recognizing its utter demise...

Ji Yuan swiftly retracted the Demon Fire with a mere thought.

The immense sea of flames receded, shrinking progressively until, upon returning to Ji Yuan's presence, it transformed into a minuscule, spectral green spark.

With a flick of his wrist, he secured the immensely potent Yin Corpse Demon Fire.

Its first deployment in battle today had yielded immensely gratifying results.

Upon the withdrawal of the Yin Corpse Demon Fire, the long-necked Serpent on the ground had fallen into absolute silence.

The residual seawater felt not hot from the inferno, but strangely colder.

With a subtle gesture, a water-blue Demon Pill detached and landed in Ji Yuan's palm.

It was marginally smaller than a typical Tier Three Demon Pill.

"Still water-attribute. Why are ice-attribute Demon Pills so elusive? Must I truly hunt a Frost Serpent solely to enhance the Fish Pond?"

Ji Yuan surveyed the remaining Demon Beast remains, including the unburnt scales.

These remnants likely held considerable value in Spirit Stones.

He casually transferred them into his Storage Bag.

Subsequently, he re-extended his Divine Sense, intending to locate the secondary stone door that Yu Yuan had mentioned.

However, the moment his Divine Sense permeated the area, a soft "Hm?" escaped his lips.

He had discovered that a peculiar symbol had materialized upon the section of stone wall seared by the Yin Corpse Demon Fire.

Prior to his arrival, upon entering, he had already comprehensively scanned the entire cave with his Divine Sense.

He was certain that this mark had not been present then.

Therefore, the sole plausible explanation was that this symbol had manifested only after succumbing to the searing effects of the Yin Corpse Demon Fire.

Ji Yuan advanced, approaching the stone wall.

The symbol before him resembled a serpentine creature consuming its own tail, coiled into a perfect circle.

Yet, upon closer inspection, he discerned that this serpent possessed four claws.

If one were to consider it a dragon, it lacked a dragon's head or any other characteristic features. Its appearance was undeniably peculiar.

Ji Yuan initially contemplated infusing a sliver of Mana to ascertain the outcome, even raising his hand in preparation.

But ultimately, he decided against it.

There was no urgency.

He would prioritize completing the primary objective, gathering the Spirit Liquid, before attending to this.

He would investigate the enigma of this mark at a later juncture.

Following this decision, he traversed the cave, soon discovering a firmly sealed stone door at its opposite end.

The exterior of the stone door was marred by innumerable claw marks, yet none possessed any significant depth, merely scratching the surface.

’To think it not only blocks Divine Sense but possesses such formidable hardness too?’

Ji Yuan promptly dispatched his Divine Sense for another reconnaissance, discovering that the block preventing his perception wasn't confined to the door; the entire section of wall before him was constructed from the identical material.

It would be more accurate to say a stone door had been carved into this stone wall, rather than merely crafting a door from the stone.

Ji Yuan located the precise spot where the Seal needed to be placed to activate the stone door, but he opted for a moment's delay.

Instead, he first delivered a powerful punch to the stone wall adjacent to the entryway.

"Bang—"

A muffled thud echoed, yet the stone wall remained utterly unaltered.

Not even the slightest impression of his fist was left behind.

"Incredibly tough!"

Astonished, Ji Yuan immediately summoned forth the Canglan Sword Embryo.

"Hmph!"

He thrust his sword forward, and the Flying Sword soared, eliciting a shower of sparks before finally carving a pit no larger than a fingertip into the stony surface.

...Seriously, just how resilient is this material?

Could it truly necessitate a Nascent Soul Cultivator to function as a miner, extracting this peculiar ore?

However, observing this, it became evident that this stone door was certainly not the creation of the Merfolk Race; they must have merely discovered it in its existing state.