Summoner Online: I Became the Tutorial Boss with a 999+ Villainess-Chapter 110: Oh, an elder...

The message arrived at dawn.

Teriam’s skeletal courier stumbled into the throne room with the kind of urgency that made every guard in the corridor snap to attention.

The creature dropped to its knees before Kai and held out a folded piece of parchment, its jaw rattling from the sprint.

Kai took the parchment and unfolded it.

The message was short. Teriam was not the type to waste words, and his handwriting reflected that. Three lines, scratched in dark ink that still smelled of forge soot.

"My Lord. The deep tunnels have broken through to a sealed chamber. The air inside is unlike anything I have encountered. I humbly request your presence. Immediately."

Kai read it twice. Then he folded the parchment and stood from his throne.

’Teriam does not use the word immediately. Ever. The man once had half his forge collapse and still filed a formal request through Sanovere before asking for help. If he is saying immediately, then whatever he found down there is either incredibly valuable or incredibly dangerous.’

He turned toward the door.

Lucifer was already standing, her dark wings half-spread, ready to move.

"Lucy, prepare the transportation crystal. Fifth Floor."

"At once, my Lord."

As they moved through the corridor, a familiar pair of footsteps fell in behind them. Kai did not need to look back to know who it was.

"My Lord, I could not help but overhear," Lyra said, matching his pace with the precision of someone who had been doing this since the day she was summoned. "If you are descending to the Fifth Floor, I would like to accompany you."

"You were eavesdropping."

"I was standing within earshot. Is that considered eavesdropping, my lord?"

’...’

Kai glanced at her from the corner of his eye. Lyra’s expression was the picture of professionalism, her posture straight, her hands clasped behind her back.

But her tail, if she had one, would have been wagging. He could see it in the way her horns faintly crackled with static.

Ever since the night he told her to wear something nice, she had been finding reasons to be near him at all hours of the day. He was fairly certain she had rearranged her patrol schedule three times this week alone, and every rearrangement just happened to place her at whatever location he was heading to next.

"Fine. Come along."

"Thank you, my Lord. I will not be a burden."

’You never are. That is the problem. If you were useless, I could send you away. But you are annoyingly competent, and you know it.’

The transportation crystal hummed to life the moment Kai placed his hand on its surface.

The violet glow enveloped them, and in the span of a single breath, the familiar darkness of the First Floor was replaced by the dry, mineral-laced air of the Fifth.

Teriam was waiting at the main junction, just as he had been the first time Kai visited the mines.

But this time, the Great Forger was not alone. A dozen skeleton workers stood behind him, their pickaxes resting on the ground, none of them moving.

They looked like they had been told to stop working and had obeyed so literally that they forgot how to breathe.

Teriam dropped to one knee.

"My Lord. Thank you for coming so quickly."

"Show me."

Teriam rose and led the way without another word.

The path took them deeper than Kai had ever gone on this floor. Past the original mining cavern where the Black Magic Crystals had first been discovered, past the reinforced tunnels that Teriam’s workers had shored up over the past weeks, and into a section of rock that felt different underfoot.

They looked and felt older and harder.

The ambient glow of the crystal veins grew dimmer as they descended, until the only light came from the faint red runes orbiting Teriam’s skeletal body and the soft violet pulse of Kai’s own mana.

Lyra walked close behind him. Close enough that if Kai stopped suddenly, she would have collided with his back.

He was fairly certain this was intentional.

Lucifer trailed further back, her wings folded tight against her body to avoid scraping the narrowing walls.

"How far does this tunnel go?" Kai asked.

"We are nearly there, my Lord. My workers broke through the final wall approximately four hours ago. The moment they did, I ordered everyone to stop and sealed the area."

"Why?"

Teriam paused for half a step, then continued walking.

"Because what lies beyond is not natural. It was placed there by someone. Deliberately."

That got Kai’s full attention.

They rounded one final corner, and the tunnel opened into a cavern that was significantly larger than anything the mining operation had uncovered before.

The ceiling rose high enough that Lucifer could fully extend her wings, and the walls were smooth, unnaturally so, as if they had been carved by something far more precise than any pickaxe.

But the thing that stopped Kai in his tracks was the door.

It stood at the far end of the cavern, embedded into the rock face like it had always been there.

Massive, easily four meters tall and twice as wide, made of a dark metal that Kai did not recognize.

The surface was covered in runes, spiraling outward from a central seal that pulsed with a faint, rhythmic glow.

Like a heartbeat.

’That is not dungeon architecture. I have memorized every material and design pattern this dungeon has generated since I became its lord. This is something else entirely. Something that was here long before the dungeon existed.’

Kai stepped forward, his eyes scanning the runes.

’I recognize some of these symbols. They are similar to the binding runes used in dragon contracts, but... I don’t know, i just cant put my fingers around it. This is ancient magic, the kind that predates the current era by centuries, maybe longer.’

He turned to Teriam.

"Did anyone touch the door?"

"No, my Lord. The moment my workers broke through and saw it, they retreated immediately. I instructed them not to approach within ten meters."

"Good instincts." Kai looked at the door again. "Has anything come out of it?"

"Not yet. But the air changed the moment the wall was breached. The mana concentration in this cavern is approximately five times higher than anything else on this floor. And it is still rising."

Lyra moved to stand beside Kai, her eyes fixed on the runes. The static in her horns had intensified, crackling softly in the charged air.

"My Lord, these binding seals are extremely powerful. Whatever is behind this door was probably imprisoned; i wouldn’t be surprised if it was some kind of weapon."

"I can see that."

Kai raised his hand toward the door, stopping just short of the surface. The mana radiating from the seal pushed back against his palm, a pressure that was firm but not hostile. More like a warning.

’The seal is still active. After what could be hundreds or thousands of years, it is still active. That means whatever power source is feeding it has not run dry. Either the seal is self-sustaining, or the thing behind the door is generating enough energy to keep itself locked away.’

He lowered his hand and took a step back.

"Teriam. What is the structural integrity of this cavern?"

"Solid. The rock in this section is far denser than anything above. I believe it was specifically chosen for that reason."

"Then we open it."

Lyra’s head snapped toward him.

"My Lord, perhaps we should study the seals first. If we breach them carelessly, whatever is inside could--"

"Could what, Lyra?" Kai turned to look at her. "Attack us? In my dungeon? On my floor?"

Lyra opened her mouth. Then closed it. Then opened it again.

"I simply wished to express my concern for your safety, my Lord."

"Your concern is noted. But I am afraid i cannot let this go without playing the safety card. Stand behind me."

Lyra reluctantly stepped back, though she did not go far. Kai noticed she had shifted into a combat stance, her mana already circulating through her body.

Lucifer had done the same, her dark wings spreading wide in the open space, her eyes glowing a deep crimson.

Kai placed both hands flat against the door.

The seal reacted instantly.

The runes flared, blazing with white-hot light that filled the entire cavern. A pulse of energy shot through Kai’s arms, not painful but intense, like gripping a live wire made of pure mana.

And then the door began to speak.

Not in words. In intent. The seal pushed a sensation directly into Kai’s mind. A question, ancient and wordless but perfectly clear in its meaning.

Who are you?

Kai’s lips curved behind his mist.

’That depends on who is asking.’

He pushed his own mana into the door, letting the full weight of his authority as the dungeon’s sovereign flow through his hands.

The Shadow of Victims.

The Dragon Slayer.

The Lord of Valdris.

The seal shuddered.

Then the runes went dark, one by one, spiraling inward toward the central lock like a dying constellation. The pulse stopped. The pressure vanished.

And the door cracked open.

A wave of cold air rushed out, carrying with it a scent that Kai recognized immediately. It was the same metallic, electric smell that accompanied high-concentration mana, but amplified a hundredfold.

The gap between the doors widened slowly, grinding against the stone floor with a low, resonant groan that echoed through the tunnels behind them.

Beyond the threshold was darkness. Not the ordinary absence of light, but something heavier, something that resisted the glow of Teriam’s runes and Kai’s mana alike.

And then something moved inside.

The sound was subtle. A low scrape, like claws dragging across stone. Followed by a deep, rumbling exhale that made the air in the cavern vibrate.

Lyra’s hand went to her side, mana coiling around her fingers. Lucifer’s wings flared wide. Even Teriam, who had no muscles to tense, seemed to stiffen.

Kai did not move.

Two eyes opened in the darkness.

They were enormous, each one the size of a wagon wheel, burning with a deep amber light that cut through the black like twin suns. They were ancient. Tired. And unmistakably draconic.

’A dragon. There is a dragon sealed beneath my dungeon.’

The system confirmed it before the creature even drew its next breath.

[Ancient Entity Detected.]

[Species: Elder Dragon - Dormant.]

[Estimated Level: ???]

[Status: Sealed. Weakened. Awakening.]

[Dragon Slayer Title - Resonance Detected.]

[New Progression Path Available.]

Kai stared at the notification, then back at the eyes watching him from the dark.

’An Elder Dragon. Not a Calamity Dragon like the ones I killed in Rambosa. Not a True Dragon like Verende either. An Elder Dragon. A tier above both. And it has been sleeping under my feet this entire time.’

The dragon’s eyes focused on Kai. The amber light in them flickered, and another deep exhale rolled through the cavern, stirring dust that had not been disturbed in centuries.

Then the voice came.

It was not loud. It was not aggressive. It was the sound of something so old that speaking itself seemed like an inconvenience it had long since abandoned.

"A Slayer... and a Sovereign."

The dragon’s eyes narrowed.

"How curious."

Kai stood perfectly still, the glow of the system notification still hovering at the edge of his vision. Behind him, Lyra’s mana was dense enough to warp the air around her hands.

Lucifer’s eyes had not blinked once.

But Kai was smiling.

’An Elder Dragon. Sealed beneath my dungeon. With my Dragon Slayer title already resonating.’

He looked into those ancient amber eyes and spoke with the calm authority of a man who had sat on a pile of dead dragons and called it a throne.

"You have been asleep for a long time. I suggest you wake up properly before we have this conversation."

The amber eyes blinked once. Slowly.

Then, from somewhere deep within the darkness, the Elder Dragon laughed.

It was a sound like mountains shifting.

"Oh, I think I am going to like you, little king."