For a long moment, nobody moved.
The knock had been quiet.
That was what made it terrifying.
If the thing beneath the First World had shattered mountains, screamed through the Bridge, or released some overwhelming force, Ayan would have understood how to respond. Power could be measured. An attack could be resisted. Even an ancient monster could be fought if it had a body that could be reached.
But a knock was different.
It was polite.
Almost hesitant.
As though whoever was beneath them was standing on the other side of a door and simply asking to be allowed inside.
Ayan stared at the cracked ground.
The fourth knock never came.
Instead, the voice returned.
"Is anyone there?"
It was unmistakably human.
A young man's voice.
There was fear in it, but not the fear of a predator. It sounded like someone who had been alone for a very long time and had finally heard another person nearby.
Ayan slowly turned toward Elira.
She had not moved.
Her face was completely pale.
Her hands were shaking.
"Elira."
She did not respond.
"Who is he?"
Her lips parted.
"My son."
The words were barely audible.
Ayan's eyes narrowed.
"Your first son."
Elira nodded.
"I thought he died."
Maren looked between them.
"You have another son?"
Elira closed her eyes.
"I did."
Rhael's golden eyes narrowed.
"Did?"
Elira looked toward the ground.
"He was born before the First World was completed."
Ayan's expression changed.
Before the First World.
That meant before the civilization.
Before immortality.
Before the Doors.
Before the Outside.
Before much of what Ayan had believed was the beginning of everything.
"How old is he?"
Elira looked at Ayan.
"I don't know."
"How can you not know?"
"Because time didn't pass normally for him."
Rowan stepped forward.
"Where was he?"
Elira hesitated.
"Below."
Rowan frowned.
"Below the First World?"
"Yes."
"Why?"
Elira looked toward the enormous city surrounding them.
"Because Ayan put him there."
Ayan felt a chill.
"I did?"
Elira nodded.
"You were afraid of what he would become."
Ayan stared at her.
"What did he become?"
"I don't know."
"Then why were you afraid?"
"Because you were afraid."
That answer disturbed Ayan more than anything else.
He looked toward the ground again.
The Bridge remained silent.
It did not react to the presence beneath them.
That was strange.
Every major entity connected to Ayan had caused some kind of response. Eon, the Outside, the First World, the ancient Doors—all of them had interacted with the Bridge.
But this presence remained outside its perception.
It was as though the Bridge could not see it.
Or perhaps...
it was something the Bridge had been built around.
Ayan crouched beside the crack.
Seraphine immediately grabbed his shoulder.
"What are you doing?"
"Listening."
"From that close?"
"Yes."
"Ayan."
He smiled faintly.
"I'll be careful."
She narrowed her eyes.
"You already used that phrase today."
"I am consistent."
"You're impossible."
Ayan leaned closer.
At first, he heard nothing.
Then—
Breathing.
Slow.
Steady.
Human.
Ayan's expression became serious.
"There's someone down there."
Rowan crouched beside him.
"Can you sense them?"
"No."
"Then how do you know?"
"I can hear him."
Rowan listened.
His expression slowly changed.
"I hear it too."
Mira approached.
"How far?"
Ayan closed his eyes.
"Not far."
"How far?"
He opened them.
"About thirty meters."
Rhael frowned.
"Thirty meters?"
"Vertically."
Rhael looked toward the city.
"Then there should be a chamber beneath us."
"There is."
Ayan stood.
"But it's not part of the city."
The ground suddenly shifted.
A section of the plaza sank several centimeters.
Everyone moved backward.
Lumen raised a barrier.
Veyra spread her wings.
The First World remained strangely silent.
The millions of people who had recently regained mortality were watching.
Ayan could feel their fear.
Some were holding their children.
Some were helping the injured.
Some were staring at him.
The creator had returned.
And now something from beneath his creation was calling for him.
Ayan understood something.
If he wanted to protect these people, he needed to know what was beneath them.
"Stay here," he said.
Seraphine immediately shook her head.
"No."
"I need to go down."
"Then I'm coming."
Ayan sighed.
"I was going to say that."
"Good."
Mira stepped forward.
"So am I."
Maren raised her blade.
"Obviously."
Rhael lifted his spear.
"My ancestors came from this world. I will not stand outside while its oldest secret is uncovered."
Veyra lowered her head.
"I am coming."
Lumen looked at Ayan.
"I won't stay behind."
Ayan looked at all of them.
"You know, sometimes I wonder if anyone listens when I tell people to stay safe."
Maren smiled.
"No."
Rowan adjusted his glasses.
"Statistically, no."
Ayan sighed.
"Fine."
Elira stepped forward.
Ayan looked at her.
"You don't have to come."
"I do."
Her voice was quiet.
"I have to see him."
Ayan nodded.
Kai stood beside her.
"I'll come too."
Elira immediately shook her head.
"No."
Kai frowned.
"I know him."
Elira froze.
Ayan looked at the child.
"You remember him?"
Kai stared at the crack.
"Not exactly."
He touched his chest.
"But something inside me remembers."
Ayan's expression became thoughtful.
"Then you stay beside me."
Kai nodded.
The group gathered around the crack.
Ayan placed his hand over the surface.
The stone felt warm.
Not naturally warm.
It had the temperature of a living body.
Ayan pulled his hand back.
"That's not stone."
Rowan examined it.
"Then what is it?"
Ayan looked at him.
"Skin."
Everyone went silent.
Maren's expression changed.
"You're saying the city is alive?"
"No."
Ayan looked beneath them.
"I'm saying something beneath the city is."
The ground moved.
A narrow staircase appeared.
It had not been there before.
Steps descended into darkness.
Each step was made from silver-black material.
Ancient symbols covered the walls.
But unlike the symbols above, these did not shift.
They were carved deeply.
Almost violently.
Ayan took the first step.
Seraphine followed.
The others came behind.
As they descended, the light from the city gradually disappeared.
The air became colder.
The walls changed.
At first they were smooth.
Then they became rough.
Then organic.
Veins of faint silver light ran through them.
Rowan touched one.
"This is extraordinary."
Maren glanced at him.
"You say that like you're not walking through a creature's body."
Rowan removed his hand.
"That was perhaps poorly phrased."
The deeper they went, the quieter it became.
No wind.
No distant sounds.
No movement.
Only their footsteps.
Ayan eventually stopped.
Ahead was a door.
Unlike the Doors they had encountered before, this one was small.
It was barely tall enough for an adult to walk through.
Its surface was made from wood.
Real wood.
Ayan stared at it.
Something about it felt familiar.
He reached toward the handle.
Elira suddenly grabbed his wrist.
"Don't."
Ayan looked at her.
"Why?"
"Because that was the door."
"What door?"
"The one you used."
Ayan's eyes narrowed.
"Used for what?"
"To put him away."
Ayan stared at the wooden door.
The memory came suddenly.
A small room.
A child.
Ayan kneeling in front of him.
The child was crying.
Ayan was holding a wooden lantern.
The same shape as the tiny lantern Theo had carved for him.
Except this one was older.
Much older.
Ayan heard his own voice.
"I'm sorry."
The child cried.
"Where are you going?"
"I'll come back."
"When?"
Ayan looked away.
"One day."
The memory vanished.
Ayan's hand remained suspended near the door.
He whispered, "I remember."
Elira's eyes filled with tears.
"You shouldn't."
"Why?"
"Because you promised him."
Ayan looked at her.
"What did I promise?"
Elira swallowed.
"That you would come back."
Ayan stared at the door.
"How long has he been waiting?"
Elira didn't answer.
Ayan turned toward her.
"How long?"
She whispered, "Longer than the First World existed."
Silence.
Ayan slowly lowered his hand.
Then he knocked.
Once.
Twice.
Three times.
Nothing happened.
Ayan waited.
Then a voice came from the other side.
"Ayan?"
The sound was filled with disbelief.
Ayan closed his eyes.
"I'm here."
Silence.
Then—
"You came back."
The door opened.
A young man stood behind it.
He looked around twenty years old.
His hair was black.
His skin was pale.
His eyes were silver.
He wore simple clothing that looked ancient but strangely clean.
He stared at Ayan.
Ayan stared back.
For several seconds, neither moved.
Then the young man smiled.
It was a small, uncertain smile.
"You look different."
Ayan swallowed.
"So do you."
The young man laughed softly.
"I suppose I should."
He stepped forward.
Elira covered her mouth.
Tears streamed down her face.
The young man saw her.
His smile disappeared.
"Mother."
Elira broke.
She ran forward and embraced him.
The young man froze.
For several seconds, his arms remained at his sides.
Then slowly...
he hugged her back.
"I thought you were dead," Elira whispered.
"So did I."
"I searched for you."
"I know."
"How?"
He smiled sadly.
"I could hear you."
Elira pulled back.
"All this time?"
"Yes."
She touched his face.
He closed his eyes.
"I heard you every time you came to the mountain."
Elira began crying harder.
"I'm sorry."
"I know."
Ayan watched them.
There was something strangely peaceful about the reunion.
After everything they had endured, after all the secrets and lies, there was no anger.
Only grief.
The young man eventually looked toward Ayan.
"You came back."
Ayan nodded.
"I'm sorry it took so long."
The young man studied him.
"You don't remember me."
"I remember some things."
"That's more than I expected."
Ayan stepped closer.
"What is your name?"
The young man's expression became sad.
"You gave me one."
Ayan frowned.
"I don't remember."
"You erased it."
Ayan froze.
"Why?"
The young man looked past him.
At the others.
At Seraphine.
At Kai.
At Lumen.
At Rhael.
At Veyra.
Then back at Ayan.
"Because you were afraid that if anyone knew my name, they would know what I was."
Ayan's voice became quiet.
"What are you?"
The young man smiled.
"I'm your first creation."
Ayan stared.
"No."
The young man's smile faded.
"I'm not a human."
"Then what?"
The young man looked down at his hands.
"I was the first thing you made that could create something without you."
Rowan's eyes widened.
"You created an autonomous creator?"
The young man glanced at him.
"I suppose that's one way to describe it."
Ayan understood.
The First World had been his first attempt at creating life.
But this boy had been different.
He had not simply been alive.
He had possessed the ability to create independently.
The ability Ayan himself had once possessed.
The ability that had eventually produced entire worlds.
Ayan looked at the young man.
"What did you create?"
The young man's eyes moved toward the darkness behind him.
"A world."
Ayan's expression changed.
"Where?"
"Here."
The ground trembled.
The young man stepped aside.
Beyond the door was not a room.
It was an enormous underground landscape.
A world existed beneath the First World.
A second sky stretched overhead, filled with artificial stars.
A vast ocean of silver water covered the horizon.
Mountains floated upside down.
Cities hung beneath them.
Forests grew along enormous walls.
And in the center of the underground world stood a single enormous tree.
Its trunk was black.
Its leaves were silver.
Its roots extended into the darkness below.
Ayan stared.
"What is this?"
The young man answered.
"My world."
Ayan stepped forward.
The Bridge reacted.
For the first time since entering the underground chamber, it came alive.
Silver light erupted around Ayan.
The young man smiled.
"It remembers you."
Ayan looked at him.
"What is your name?"
The young man hesitated.
Then he whispered:
"Caelum."
Ayan's eyes widened.
The name struck him with a strange familiarity.
Caelum.
The name the silver-haired traveler had once been associated with.
The name he had heard before.
The mysterious traveler who had watched him from afar.
The young man noticed Ayan's expression.
"You've heard it."
Ayan nodded slowly.
"Someone else used that name."
Caelum smiled.
"Of course."
Ayan's heart tightened.
"Who?"
Caelum looked toward the enormous silver tree.
"My brother."
The world became silent.
Ayan remembered the cloaked traveler.
The silver hair.
The distant eyes.
The way the traveler had watched him.
The name Caelum.
Ayan looked at Elira.
She looked equally shocked.
"You said you had one son."
Elira stared at Caelum.
"I thought..."
Caelum interrupted gently.
"There were two."
Ayan felt the Bridge tremble.
Caelum looked toward him.
"And one of us was supposed to become you."
Ayan's expression hardened.
"What?"
Caelum pointed toward the silver tree.
"But he became something else."
The tree moved.
Its enormous branches shifted.
Silver leaves fell like snow.
And from somewhere deep within the underground world, a voice echoed.
"Ayan."
Everyone turned.
Ayan's blood ran cold.
He knew that voice.
The same voice that had watched him from afar.
The same presence he had never been able to identify.
The cloaked silver-haired traveler stepped out from behind the tree.
His face was hidden beneath the hood.
But this time...
he lowered it.
Silver hair fell around his face.
His eyes were calm.
His expression was strangely familiar.
Ayan stared at him.
The traveler smiled.
"Hello, little brother."
Ayan could not breathe.
Caelum looked at him.
"Meet your first brother."
The traveler extended his hand.
"My name is Caelum."
Ayan stared at him.
Then at the other young man.
Then back at the traveler.
Two sons.
Two creations.
Two beings born from the same origin.
And one of them had been watching Ayan for a very long time.
Ayan finally understood why the traveler had always stayed at a distance.
Why he had never attacked.
Why he had always seemed to know more than he should.
He had not been watching Ayan because he was waiting for him to fail.
He had been waiting for him to remember.
The silver-haired Caelum looked toward the ceiling.
Then his expression changed.
"Ayan."
"What?"
"You need to leave."
Ayan frowned.
"Why?"
The underground world began trembling.
The enormous silver tree shook.
Its roots moved.
Something beneath it was waking.
The silver-haired Caelum's expression became grim.
"Because I wasn't the one who knocked."
Ayan's face changed.
"Then who was?"
Caelum looked downward.
His voice became almost a whisper.
"Father."
The word echoed through the underground world.
The Bridge went completely silent.
And beneath the silver tree...
something opened its eyes.