My Perfect Isekai: Pragmatic Protagonist, Progression Fantasy and Strategy

The ninety-fourth floor of the Oakhaven dungeon greeted us with a apocalyptic landscape that resembled a liquefied industrial foundry designed by an insane primordial deity.

Here, deep within the subterranean roots of the mountain, the volcanic heat reached a staggering three hundred and fifty degrees Celsius. The ambient atmosphere was so thick with heavy metal vapors, suspended iron dust, and sulfurous gasses that an unaugmented human would have suffocated in seconds, their lung tissue seared and liquefied by the toxic, superheated fumes. Rivers of molten, liquid silver bubbled along jagged basalt troughs, glowing with a harsh, mirror-like sheen under the vaulted, obsidian ceiling. The heat radiated from the rock with physical force, distorting the air into shimmering, dizzying waves.

”Tactical radar’s picking up heavy metallic density directly along the main conduit, boss!” Kaede’s cheerful, high-pitched ping echoed in my left ear in our native Polish operational cipher. ”Paczka płynnych srebrzaków na szlaku! Pięć sztuk w korycie magmy! Ich rdzenie są w pełni zatopione w płynnym srebrze, a pancerz formują z czerwonawego, wulkanicznego bazaltu! Będzie ciężko to załatwić klasycznym cięciem, bo srebro zaraz oblepi ostrze i stworzy spoinę!”

”Then we don’t use classic cuts,” I replied calmly, my hands buried deep in the pockets of my long black coat.

I stood on a narrow obsidian shelf overlooking a vast basin of churning, boiling silver. Beside me, Shnee adjusted the collar of her black coat, her azure eyes coolly scanning the bubbling metallic lake with feline alertness. Thanks to the active thermal sphere of my Sapphire Slime, the temperature within a five-meter radius around us remained at a pleasant, crisp eighteen degrees Celsius. Inside our localized atmospheric bubble, the air was cool, clean, filtered, and effortless to breathe, providing a stark, surreal contrast to the boiling hellscape just inches beyond our perimeter.

From the churning liquid silver, five massive entities materialized with a sickening, heavy metallic squelch.

They were Basalt Matrix Crawlers—fifteen-meter arachnid constructs formed from liquid silver bodies encased in heavy plates of cooling, reddish-black basalt armor. Their multiple glowing crimson eyes locked onto us through the heat haze, and they unleashed a synchronized, metallic screech that vibrated through the stone floor beneath our boots.

”Kaede, pinpoint the primary cooling vents on their basalt shells,” I instructed, stepping smoothly to the very edge of the obsidian shelf. ”Don’t let them stabilize their external temperature.”

”Już się robi, szefie!” the spider chirped eagerly from my pauldron. ”Prawy stwór ma mikro-nieszczelność na karku! Drugi na lewo ma pęknięty pancerz przy odwłoku od ciśnienia magmy! Dajesz, szefie, czysta fizyka płynów i szok termiczny!”

Instead of drawing Orcrist or expending my Vessel’s internal energy on flashy spells, I relied on pure kinetic manipulation and fluid dynamics. I raised my right hand, extending my fingers toward the lead crawler with cold, mechanical precision.

A dense, high-pressure stream of Sapphire Slime shot from my palm, splitting into five distinct, razor-sharp tendrils in mid-air. The blue slime didn’t attack the heavy basalt armor directly; instead, it targeted the exact joints where the liquid silver flowed freely between the stone plates.

The microsecond the slime made contact with the molten silver, the specialized kinetic properties of my slime absorbed the thermal energy, causing an instantaneous, violent chemical reaction. The liquid silver within the crawlers’ joints solidified in a fraction of a millisecond, expanding rapidly as it crystallized into rigid metallic needles.

CRACK! CRACK! CRACK!

The heavy basalt plates covering the crawlers shattered under the monstrous internal pressure of their own frozen joints. The massive creatures shrieked in agony as their outer defenses crumbled into piles of inert slag and smoking debris, exposing their vulnerable core nodes.

”Shnee, clear the core nodes,” I commanded smoothly.

”Understood, Dave,” the white-haired elf replied instantly.

She blurred forward like a pale phantom, her Celestial Silver rapier executing a series of breathtakingly precise thrusts. She didn’t waste momentum on heavy, theatrical swings. Her blade found the exact gaps created by my slime, driving deep into the glowing core nodes of the crawlers. Concentrated frost mana erupted from her weapon upon contact, freezing their liquid silver circulatory systems from the inside out in a flash of white frost.

Within three seconds, all five giant crawlers froze into motionless, brittle statues of silver and stone. Shnee lightly tapped the nearest construct with the pommel of her rapier, and the massive monster disintegrated into a shower of harmless metallic dust and glowing purple loot drops.

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”Clean liquidation,” Shnee reported quietly, sheathing her rapier with a soft, satisfying click. ”Zero energy wasted.”

”Radary czyste, szefie!” Kaede added with a satisfied click of her chelicerae. ”Zero strat w materiale! Łup zebrany, rdzenie całe! Jesteś po prostu chirurgiem tego lochu!”

I telekinetically gathered the glowing purple cores and the solidified lumps of high-purity silver from the ground, depositing them neatly into my spatial pouch. The raw materials on these lower floors were worth a fortune on the Oakhaven black market. Silas would probably lose his mind when he saw the purity of the liquid silver ore we were bringing back.

”Silas is going to have a stroke when he sees this quality,” I noted, holding up a dense, palm-sized ingot of refined liquid silver that had solidified into a flawless metallic mirror. ”In the Upper Quarter, pure silver of this grade is used exclusively for enchanting high-tier holy relics and royal conduits. Market price is easily five hundred gold coins per kilo.”

”A znaczy, że nasza baza w Crossgardzie będzie miała tytanowy budżet!” Kaede chimed in, rubbing her front legs together greedily. ”Szefie, kupimy najnowocześniejsze narzędzia, dębowe stoły i najlepszą garbarnię w całym regionie! Silas będzie płakał, ale zapłaci co do miedziaka!”

Shnee nodded approvingly, taking a small drink of water. ”The finances of the First Pillar are securing themselves at an exponential rate. With this capital, no merchant guild in Oakhaven or Crossgard will be able to pressure us.”

We continued our march, descending deeper along the basalt staircases into the ninety-fifth floor.

The ninety-fifth floor marked the threshold of the deep dungeon—a massive, vaulted cavern known as the Obsidian Citadel Approach. Here, the cavern walls were composed entirely of pitch-black, polished obsidian that reflected the deep crimson light of the magma rivers below like a dark, demonic mirror.

In the center of the vast approach stood the guardian of the threshold: a twenty-meter-tall Obsidian Dreadnought. The giant construct was forged from solid, runic obsidian, holding a massive tower shield in its left arm and a forty-foot halberd in its right. Its chest glowed with an intense, pulsating violet light—the power source of a high-tier dungeon boss.

”Boss, ten kloc ma potrójną warstwę runów ochronnych na całej tarczy!” Kaede warned sharply, her tone becoming intensely analytical. ”JEGO TARCZA MOŻE ODBIĆ KAŻDY ATAK ELEMENTARNY! Pancerz ma grubość dwóch metrów litego obsydianu! Szefie, jak to ugryziemy?”

”Simple engineering, Kaede,” I replied calmly, taking a slow, measured step forward. ”Every rigid structure has a resonant frequency. The harder and denser the material, the more susceptible it is to harmonic vibration.”

I unbuckled the brass clasps of my black coat, letting my Vessel’s internal reactor hum at a rock-solid sixty percent capacity. Sapphire energy flowed smoothly through my widened conduits, gathering in my right fist like liquid plasma. I didn’t bother forming a blade or an arc of lightning.

I broke into an effortless sprint, closing the fifty-meter distance in less than a second, my boots barely brushing the obsidian floor.

The Obsidian Dreadnought roared, bringing its massive tower shield down with enough force to shatter a mountain ridge. The sound of the shield hitting the basalt echoed like an artillery barrage, creating a violent shockwave of compressed air that blew away the surrounding sulfur fumes.

I didn’t try to dodge or go around the shield.

Instead, I leaped directly toward the center of the two-meter-thick obsidian barrier. Mid-air, I coated my right arm in a thick, glass-smooth layer of black Gōtai. I focused my kinetic output into a high-frequency, ultrasonic pulse—a concentrated vibration designed to match the structural frequency of volcanic obsidian.

My black fist struck the exact center of the tower shield with a quiet, dull THUD.

For a split second, nothing happened. The giant Dreadnought seemed to sneer down at me from behind its impenetrable wall.

Then, the physics of harmonic resonance executed its inevitable, non-negotiable verdict.

BBZZZZZZT—CRACK!

A web of microscopic hairline fractures instantly spiderwebbed across the entire surface of the massive tower shield. A microsecond later, the structural integrity of the two-meter obsidian wall completely collapsed. The shield exploded outward in a blinding burst of black glass shrapnel!

Before the Dreadnought could register the destruction of its primary defense, I drove my Gōtai-coated left hand straight through its exposed chest plate, grabbing the glowing violet core within its stone ribcage.

”Disposal completed,” I muttered coldly.

I ripped the core free and crushed it in my grip. The twenty-meter Dreadnought stiffened, its crimson eye lights flickering out, before its massive body collapsed into a harmless heap of obsidian rubble.

Shnee landed softly beside me, looking at the mountain of black glass with a subtle, admiring smile. ”A single vibration pulse to shatter two meters of runic obsidian. Your efficiency continues to defy standard tactical logic, Dave.”

”It’s just applied physics, Shnee,” I said, wiping a speck of black dust from my coat sleeve. ”Hard materials don’t bend; they break. You just have to know where to push.”

I placed the glowing violet core of the Dreadnought into my pouch alongside three kilograms of dense obsidian glass shrapnel.

”Runic obsidian of this density retains kinetic charges,” I remarked, examining a razor-sharp fragment under the dim crimson light of the magma. ”If Kaede weaves this glass into her slime threads, her tactical webs will be able to sever iron armor on contact without losing structural elasticity.”

”Szefie! To genialne!” Kaede gasped, her eyes glowing with excitement. ”Pajęczyna z kwasowo-szklanym ostrzem! Każdy dezerter czy krasnoludzki najemnik, który w to wpadnie, zostanie poszatkowany jak szczypiorek na rosołku! Dajesz, szefie, robię projekt w głowie!”

”Szefie! To był absolutny rozpiździel!” Kaede cheered, doing a little victory dance on my shoulder. ”Jeden cios i kloc zniknął! Dziewięćdziesiąte piąte piętro officially cleared! Mamy otwartą drogę na sam dół!”

I looked down the long, dark corridor leading deeper into the abyss. Beyond the ninety-fifth floor lay the final stretch before the ultimate boss arena of the lower levels. My Vessel was operating at a rock-solid sixty percent efficiency, my pathways were tempered and stable, and our team synergy was flawless.

”We take a brief five-minute rest,” I said, pulling a jug of cold spring water from my spatial pouch and handing it to Shnee. ”Then we clear the remaining floors and finish this run.”