Everyone finally decided to return to the guild after experiencing the previous battle. It was clearly a fight that couldn't be won by a D-ranked adventurer. Choosing to retreat was the best course of action rather than recklessly continuing. Our lives were currently the priority over a mission.

As for myself, I decided to stay inside the dungeon to continue the mission. Everyone opposed me when I said I wanted to stay and explore the dungeon further. It was a natural reaction considering I wanted to remain in the dungeon. Some people opposed my wishes, thinking I made a foolish choice, while others were worried about my decision.

It took quite some time to persuade the adventurers to return to the guild first and leave me here. I had to showcase some of my abilities to make them believe in my decision. I told them that my abilities had been acknowledged by the guild master and that my skills were comparable to those of an A-ranked adventurer.

Reluctantly, Flitz's group and the others agreed to my request to stay inside the dungeon. I also instructed Flitz's group to inform the guild master that this was my own decision to continue exploring the dungeon so that they wouldn't be blamed for leaving me behind.

After storing all the Minotaur corpses in my storage, I continued on my journey. At the end of the area where we fought the Minotaurs, there was a large corridor that seemed to be a connection to the next room.

I didn't know what kind of enemies I would face ahead, so I kept activating my perception and detection abilities as a precaution. With these abilities, I felt safer from sudden monster attacks and could walk calmly even in the darkness. It was like wearing infrared goggles with added radar detection capabilities. I probably wouldn't dare to explore this dungeon alone if I didn't have my detection and perception abilities.

This was an incredibly large corridor when I saw it. It was larger than the corridor we had passed through before, perhaps the size of an underground tunnel. Its aura felt even more menacing as I walked alone. I could only see darkness when I looked around since I wasn't currently using the light sphere ability like before.

Now I could move more freely than before. I no longer had to walk and fight while protecting others behind me. It was quite troublesome when my actions depended on the condition of others. And now, I would have the freedom to execute various types of attacks without worrying about people around me.

It was a wise decision to send Flitz and the other adventurers back first. Even if they insisted on continuing the exploration, they would face greater risks. With their limited strength, they wouldn't be able to handle the next room. Through my magical perception, I sensed that the room I was heading to now would be significantly more challenging than before. It not only had a higher concentration of magic but also seemed to contain enemies several times stronger than the ones we faced previously. And now, I was still walking within the corridor, which was clearly longer than the first corridor I passed through.

"Wow... This is quite impressive," I muttered as I beheld the sight before me.

After walking for quite a while, I finally reached a room larger than the previous ones. It was no longer an empty and dark space.

It was a room filled with magical crystals of various colors and sizes. Almost every wall was covered in glowing crystals, illuminating the entire room. They seemed to grow naturally from the walls. These were magical crystals, as I identified them, and they would likely fetch a high price if I were to sell them. Unfortunately, they were firmly embedded in the walls, so it would be futile to try and remove them.

"They're really sturdy," I grumbled while trying to pull one of the magical crystals with all my might.

No matter how much force I exerted with both hands, it didn't budge even a bit from its position. I even infused it with magic energy while attempting to pull it but to no avail. It remained untouched when I tried to break it with my sword. At the very least, I wanted to take one of these crystals as a memento from this dungeon. Perhaps it would be worth a fortune if sold on the surface. Even the finest diamond on Earth couldn't surpass the beauty of these magical crystals.

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It also made me curious about how so many magical crystals formed in this room. When did they all form? And was this the only room with magical crystals? Another puzzling aspect was how to report this room to the guild. It wouldn't be right for me to remain silent about it. The guild would likely have many questions about this dungeon when I returned. Since I was exploring the dungeon alone, I bore the responsibility of making a report regarding everything related to the dungeon. Filing a report was something every adventurer had to do upon completing a mission for the guild. The report would also affect the evaluation of my adventurer's license, similar to a performance appraisal for an office worker.

After thoroughly examining every corner of the room, I walked straight toward a large double door at the end of the room. Considering the size of this room, it was roughly the size of two football fields. It was an immense space filled with incredibly valuable magical crystals. Although it wasn't gold, one could consider it a treasure trove. The magical crystals in this room might even hold more value than gold.

In addition to the crystal-covered walls, the path I was currently walking on appeared to be made of silver-colored crystal plates. It seemed that the floor also had the ability to replenish magical energy. As my feet touched the floor of this room, I felt a warm sensation and something flowing into my body. There were also round pillars, about two meters high, standing on each side of the path. There were about ten pairs of pillars extending all the way to the end of the door.

Then, before reaching the end of the door, there was a large bridge with a clear river flowing beneath it. The river itself wasn't very deep and flowed beneath the walls of this room. Seeing a river flowing inside a dungeon room made me wonder if it occurred naturally. It was the first time I had witnessed such a sight.

Now I stood in front of the open, massive door as if it had been waiting for me to enter. It was a double door made of iron, entirely black without any ornamentation. However, it emitted a dark aura that felt intimidating.

I immediately prepared my two swords and magic attacks because it seemed that a group of monsters awaited me ahead. I could sense it the moment I set foot inside this room.

Without delay, the group of monsters attacked me, or rather, they charged toward me. Unlike the humanoid monsters I encountered earlier, this time they resembled black-skinned rhinoceroses with two long horns on their foreheads.

[Fire arrow] [Fire arrow]

I immediately unleashed several consecutive fire magic attacks, hitting multiple monsters simultaneously. However, it seemed that my fire magic had no effect at all. It only left small scratches on the monsters. I doubted these monsters had fire resistance; perhaps their skin was just incredibly thick, enough to withstand my fire magic attacks.

"*Clang!"

My sword clashed with one of the monster's horn tips. I tried to withstand the charge of one of the monsters with both swords crossed in front of me. This monster truly possessed tremendous strength as it pushed against me, making it quite a struggle to hold my ground.

I prepared a wind magic spell beneath my feet and swiftly leaped high using the wind magic I had prepared beforehand to evade the monster in front of me.

"*Bruuaaak..."

The monster crashed into the door behind me with great force when I suddenly dodged. Even that impact couldn't break its horns. Although these monsters only had one type of attack, their body defenses were exceptionally strong, evident from their ability to withstand my magic attacks.

While still floating in the air due to the wind magic leap, I quickly launched another fire magic attack. Just like before, my fire magic only left small scratches on its skin.

After landing on the ground, I immediately attacked one of the monsters, attempting to imbue my sword with the fire attribute. Then I swung my sword vertically toward the monster, finally leaving a deep slash on its body. It seemed I had found an attack that might be effective.

"*Wuush..." "*Slaash..."

I continued my consecutive slashes, maintaining the fire attribute on my sword. After a while of employing the same attack pattern, I managed to defeat all the monsters and stored their corpses.

Afterward, I proceeded towards the room ahead, which appeared to be the final room of the dungeon. I could feel it from the overwhelming magical energy emanating as I started walking towards the room. The intensity of the magical energy was greater than all the rooms I had passed through, exerting strong pressure on my entire body.

"Oh, it seems there's another visitor in this dungeon."

A person in a black cloak greeted me shortly after I entered the last room of the dungeon. A dark and deathly aura seemed to envelop the person, who was sitting on a large Cerberus corpse.