My Ultimate Sign-in System Made Me Invincible

Chapter 256: Skeleton Dungeon


Liam found himself inside what looks like a cave, when he stepped out from the other side of the portal.

The cave was dark but he could still see, thanks to his enhanced eyesight. He noticed that the cave looks like something that was still in use.

"Where am I? What is this place?" Liam thought to himself.

The cave looks like what one would see in a dungeon manhwa but he wasn't sure, as he couldn't sense anything even after spreading out his telekinetic sense.

He decided to ask the only entity that can give him the answers to his questions.

"System," he called but he got no response. He tried calling Lucy but there was also no response.

"Sigh... Not again," he muttered in a low voice.

It was just like the first time he visited the cultivation and magic universe. He had found himself dropped in a forest but times, and now it's a cave.

Liam looked around, trying to make sense of where he was and the direction that leads out of the cave. He crouched to his knees and studied the ground for any sign that would tell him anything.

He noticed what looks like footprints but not footprints at the same time. He studied the footprints and he noticed that it wasn't exactly left behind by a foot or feet, but skeletons?

It looks like it was left behind by something with no flesh covering its foot skeleton. A skeleton monster? Was I transported to a skeleton dungeon?

Liam has so many questions but since he had no one to answer them for him, he could only get them himself.

He observed the footprints and noticed the direction in which it was walking in and he decided to follow it. He has no idea if it would lead to the dungeon's exit but doing that was better than waiting around and doing nothing.

Liam had followed the footprints for about a minute before his telekinetic sense finally picked up the outline of something different from the rocky and damp surface of the cave.

His telekinetic sense picked up the outline of three skeletons, each of them holding a weapon in their hands.

So, it's really a skeleton dungeon. I wonder how strong they are and what the boss is like, Liam thought to himself.

While he had found it pretty inconvenient to had been transported into a dungeon, he knew that complaining won't change anything.

Besides, he wasn't worried about being any sort of life threatening danger, as he has multiple ways to ensure his safety.

But while he wasn't worried, doesn't mean that he wasn't going to be cautious. He made sure not to make any sound as he sneaked up behind the three skeletons.

As he got closer, he noticed that the weapons they are holding are old, cracked swords that looks like it would break at the smallest impact.

Liam wasn't interested in the swords but the skeletons. He decided to make his move as he had gotten close enough. He reached out his hand and enveloped them with his telekinetic field, pinning the three of them to the spot.

He didn't allow them a chance to properly react, as he made a downward getsure with his hand. A crushing force befall them, shattering their bones across the dungeon floor.

I wonder if they also have monster core, Liam thought to himself, observing the bones on the floor.

Since his telekinetic sense can't see past a barrier and into something, he can only examine the individual.

He checked the rib cage of one of the skeletons and he saw a blue shiny rock attached behind it. He pried it free from the cage, before dropping the cage back on the floor with a loud clanking sound.

So, they do have monster cores. Good for me then.

He immediately made the other two rib cages float towards him and extracted the monster cores attached behind them.

He observed the small blue rocks in his hand for a moment, before sending them into the Dimensional Space.

With the Dimensional Space opened now, Liam could call Lucy—not that he was ever restricted from accessing it—but he decided against it. Lucy can't help his situation. He has to clear this dungeon or get out of it through the entrance if that's possible, and understand where the portal opened to.

Liam continued walking deeper into the dungeon. He knew this because the air was getting damper.

He had walked a few steps when his telekinetic sense caught the outline of more skeletons. But unlike the first time, he didn't hide his presence.

Liam didn't hesitate the moment his eyes caught the first cluster of skeletons moving ahead. He raised a hand and unleashed a wave of telekinetic pressure that slammed into them like an invisible hammer. Their brittle bones cracked in midair before they could even turn toward him.

He didn't slow down. He advanced, crushing one after another. His movements were silent and precise.

The dungeon echoed only with the sounds of splintering bones, as dozens fell in moment. But the noise didn't go unnoticed.

The clatter of skeletal feet echoed through the tunnels—dozens of them, maybe hundreds, marching toward him from every direction. The sound was sharp and hollow, like hailstones striking metal.

"Guess I woke the neighbors," Liam sighed softly, his expression calm.

He spread his telekinetic sense outward, mapping the oncoming tide. The entire dungeon corridor ahead was crawling with movements—skeletal warriors, some armed with swords, others with cracked shields or spears. They flooded from the darkness in waves.

Liam didn't wait for them to come to him as his figure blurred forward, streaking through the misty corridors like a dark phantom.

Every time he passed a cluster of skeletons, they shattered behind him, bones scattering like glass fragments. His telekinetic field lashed out in sweeping arcs, crushing everything in its path with pinpoint force.

Within seconds, tens, maybe hundreds of skeletons lay broken on the ground, their remains forming a jagged carpet of white fragments on the ground.

Liam looked at the countless piles of bones and shook his head with a faint sigh.

"…That's a lot of cores."

He knew each of them carried a small blue rock embedded within their ribs, just like the first few. But the idea of individually prying them out from hundreds of bodies felt more like punishment than profit.

He opened the Dimensional Space and summoned the extraction bot.

"Same process as before," Liam instructed. "Extract everything you find and send it into storage."

The bot beeped once in acknowledgment before flying off, extending multiple small arms as it began its systematic work.

Liam didn't linger to watch. He turned toward the deepest part of the dungeon, walking through the sea of bones as if he were strolling down a quiet street.

The deeper he went, the more the dungeon changed. The rocky tunnel widened gradually, the walls became more smooth and damp, almost as if polished by something over centuries.

Liam knew what that meant.

The boss room is close.

After a few more steps, the passage opened into a massive chamber. The ceiling disappeared into darkness, supported by enormous bone pillars. Torches burned with ghostly blue flames, casting long, flickering shadows across the floor.

And at the far end of the chamber stood a throne.

It was crude, forged entirely from skulls and femurs stacked together, yet it radiated authority. Sitting on it was a single figure—motionless, silent, but unmistakably different from the others.

A skeleton, yes. But this one was massive as it was easily three meters tall. A rusted black great sword rested across its knees. Its hollow eye sockets burned faintly red, like dying embers waiting to reignite.

And for the first time, Liam felt pressure from monster. But he wasn't scared or worried. Quite on the contrary, he was excited.

"So, you're the boss. Nice. I specialise in killing things like you," he smiled even wider.

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