I was lost in thought, speculating on whether the boss would be a giant version of the Level 5 slimes or perhaps a swarm of mosquitoes, when a sudden change in the atmosphere caught my attention. I looked up and was immediately puzzled by the state of the doors.
Barely five minutes had passed since the trio entered, yet the white pulse around the doorframe was already beginning to fade. I blinked in astonishment. I had initially written them off as merely arrogant, but it seemed they possessed the strength to back up their attitudes. No other party I had seen today, even those consisting of six well-equipped raiders, had managed to clear the chamber this quickly. Their efficiency was unsettling.
Still reeling from the display of power, I watched as the glow extinguished entirely. The doors remained shut, but the lack of light indicated the room was once again vacant. Taking a deep breath to steady my nerves, I stepped forward and pushed against the black stone. The doors swung inward, revealing a slit just wide enough for me to pass through. The moment I crossed the threshold, the doors slammed shut behind me with a heavy, final thud.
The interior was a jarring departure from every other boss room I had entered. On the first four floors, the chambers were identical: smooth, clinical domes with glowing geometric lines along the walls. This room, however, was a wild, untamed cavern. When the doors locked, the characteristic dungeon veins flared to life on the outer perimeter, illuminating a landscape of jagged stalactites hanging from the ceiling and sharp rock protrusions erupting from the uneven floor.
The air was damp and carried a heavy, musky scent. This wasn't a standard arena; it was a predator’s lair—a place designed for a hunter to drag its prey into the shadows and devour them in safety.
I scanned the room, looking for the usual manifestation in the center, but I found nothing. A cold spike of anxiety shot through me. Getting flustered, I frantically looked around the chamber, peering behind the larger rock formations. That was when I saw it.
Coiled around a cluster of stalagmites near the far wall was a pair of glowing, slit eyes. It was watching me with the predatory intensity of a cat observing a mouse that had wandered too far from its hole. I felt goosebumps prickle across my skin as I met its gaze. Knowing that another living thing is actively calculating how to eat you alive is a unique kind of nuisance that is hard to ignore.
As I tracked its movement through the shadows, the creature’s silhouette became clear. It was a serpent. But it wasn't a normal snake; it was a behemoth, at least five meters in length with a body as thick as the giant centipede I had faced on the second floor. What surprised me most was the lack of consistency—I hadn't encountered a single snake-type enemy in the corridors of the fifth floor.
I focused my mind and activated my ‘Identify’ skill to clear my suspicions.
***
Race: Predator Serpent
Sex: None
Status: Normal
Level 5 Mini Boss
***
It was indeed a serpent, but the designation was different. This wasn't a "Floor Boss" like the previous ones; it was a "Mini Boss." I didn't know the exact hierarchy of power between those two titles, but I assumed a Mini Boss would be a significantly greater challenge. I steeled my resolve. Even if I found myself outmatched, I could always use my remaining points to boost my stats mid-fight or escape entirely using the ‘Warp’ spell.
The serpent was a patient bastard. It observed me for nearly a minute, its tongue flickering out to taste the air, before it finally began to move. It used the gaps between the rock protrusions to obscure its bulk, shortening the distance between us while keeping most of its body hidden from my sight.
I knew from my dream world memories that fighting an enemy with a tail required thinking of them as two separate entities. A serpent can strike with its fangs from the front while whipping its tail around from a blind spot. While many of my dream experiences—swordsmanship and social interactions—felt half-assed or misdirected in this reality, the basic fighting reflexes remained useful. I reminded myself to fight like an amateur: relying on my high stats and reacting to the immediate reality rather than overthinking based on potentially false memories.
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I braced my shield and narrowed my focus as the serpent lunged. It opened its jaws wide, revealing rows of needle-sharp teeth on both its upper and lower mandibles. I recalled a fragment of knowledge from Earth—that snakes with multiple teeth were generally non-venomous—but I knew better than to bet my life on high school biology in a magical dungeon.
The snake lunged for my shield, clearly intending to bite down and pin me in place so it could coil around my body. It was a classic grappler tactic. I refused to let it dictate the pace. Just as its fangs were about to snap shut, I skidded a few inches to the right and delivered a forceful shield bash to its upper jaw.
Crack.
The impact was louder than I expected. Despite the serpent’s massive size, my Strength stat sent its head flying back with a violent jerk. It stumbled for a heartbeat, its head arching toward the ceiling while its main body remained grounded. I seized the opening and dashed forward to deliver a lethal strike before it could recover.
Just as I came within range, a dark shape whipped around from my right. It was the tail. I pivoted mid-stride, raising my shield to catch the heavy blow. The force of the tail strike was substantial, but I leaned into the impact, using the momentum to push myself closer to the creature’s head and disrupting its attempt to encircle me.
I slashed at the serpent's head, but the creature was surprisingly limber. It tilted its neck to the left, and my blade merely grazed its flesh. I applied more force to change the course of the swing, managing to cut a shallow red line through its scales. A thin trail of crimson blood seeped out of the wound.
It wasn't a severe injury, but it told me everything I needed to know. The serpent was fast, though not as quick as a mosquito. Its scales were tough but not as impenetrable as a centipede's chitin. Its greatest asset was its raw physical strength and its ability to use its tail as a secondary weapon.
The serpent recoiled, distancing itself and becoming far more wary. It held its body in a crescent shape, clearly trying to flank me from both sides. It glared at me with pure disdain. I decided to end the stalemate. I planted my right foot firmly and charged toward its head again, angling my run to the left to stay outside of the "encirclement zone."
As I closed the distance, the serpent tried to reset its tail. Before I reached its head, it lashed out with its rear half again. I stepped left to dodge the blow, a move that was becoming second-nature. I pursued the head further, but the tail came around again from the right, preventing me from committing to a forward strike.
I realized that if I kept playing defensively with my shield, the serpent would eventually tire me out or find a gap. I decided to meet its next tail attack with my sword. I knew I could harm it; the only risk was the blade getting stuck in its muscle. I waited for the next whip-like motion and slashed with all my might, aiming to cut as deeply into the tail as possible.
CLANG.
The recoil from the impact was much stronger than when I had grazed its neck, sending me stumbling back several meters. But the serpent had it worse.
“TSSSS!”
The creature let out a high-pitched, enraged hiss of agony. Its tail was coiling and uncoiling violently, bleeding profusely from the deep gash I had delivered. The serpent was so focused on the throbbing pain that it left its entire front half exposed.
I didn't waste the opportunity. I closed the gap in a blur and activated the Warrior job skill: Survival Instinct.
***
Warrior:
Skill: Survival Instinct
- Half of the endurance stat will turn into the agility stat for (5 + 0.1 * level) seconds.
- Skill cost = 20 mana
***
A surge of energy flooded my legs. My speed felt as though it had multiplied by 1.5 times. I arrived at the serpent's head before it could even turn its gaze back to me. I aimed my steel sword at the joint connecting its upper and lower jaws—a critical weak point.
I swung with every ounce of strength I possessed. The serpent tried to twitch away, but my increased speed was too much. The blade bit deep, slicing from the right side of its face through to the nape of its neck. It was a lethal, gaping wound.
The serpent was now a dying animal, thrashing in its own blood. I used the remaining seconds of my Agility boost to dash to its left side, positioning myself to finish the job. As the skill faded, I reached the spot I wanted. To ensure this final strike was absolute, I activated the Swordsman skill: Sword Dance.
***
Swordsman:
Skill: Sword Dance
- You increase your dexterity and agility (0.5 + 0.01 * level) for 20 seconds
- Skill cost = 20 mana
***
As the skill activated, I felt a sharp, stabbing pain in the center of my forehead—a sensation like a pulled muscle, but deep inside my brain. It was a strange, draining feeling I hadn't experienced when using the Warrior skill. I realized then that my "Mana" was a literal resource, and using it had a physical toll on my mind.
I pushed through the mental fog and the increased dexterity made the sword feel like an extension of my arm. I brought the steel blade down on the opposite side of the previous wound. The blade met significantly less resistance this time, cutting through the remaining bone and muscle with ease.
“Tssss...ss...s…”
The serpent’s hiss died out into a soft, wet sputter. Its massive head rolled onto the stone floor, and the body fell flat, finally motionless. I stood over the carcass for a moment, breathing hard, as the "Mini Boss" began to dissolve into the dark mist of the dungeon.
I had cleared the fifth floor, but the mental pain from the skill usage lingered, a grim reminder that I was still learning the true cost of my power.
[Edited]