There was no explosion.
There was something worse.
Silence.
For several seconds, Elias heard nothing.
Then he realized he was standing somewhere that wasn't Earth.
There was no ground beneath his feet.
No sky.
No stars.
Only darkness.
Mara floated beside him.
"Elias?"
"I'm here."
"Where?"
"I don't know."
Adrian Vale appeared in the distance.
He looked different now.
Younger.
Almost as he had looked in the original AEON-1 photographs.
"This is the boundary," he said.
"The boundary between universes."
Elias looked around.
"Where is the Engine?"
"Everywhere."
Mara looked frightened.
"What does that mean?"
Vale pointed into the darkness.
Thousands of images appeared.
Worlds.
Earths.
Alien planets.
Dead civilizations.
Living civilizations.
Entire universes appeared as fragments.
Elias saw one Earth where humanity had never discovered electricity.
Another where humans had reached the stars centuries earlier.
Another where dinosaurs still ruled the planet.
Another where Earth had never formed.
Another where he had never been born.
"This is what the Engine was doing," Vale said.
"It was searching through possibilities."
Mara stared.
"Why did it choose us?"
"Because you were the first universe to detect it."
Elias understood.
The Engine wasn't simply moving through realities.
It was using observers.
Every time someone remembered another reality, the boundaries weakened.
That was why he was important.
His memories were connecting worlds.
Vale looked at him.
"You have one decision left."
Elias frowned.
"What decision?"
"Destroy the Engine."
"That's what we're trying to do."
"If you destroy it, every connected continuity collapses."
Mara stepped forward.
"And if we don't?"
Vale looked at her.
"The Engine will continue."
"How long?"
"Until no universes remain."
Mara went silent.
Elias looked at the countless worlds around him.
Billions of possible Earths.
Billions of histories.
Billions of lives.
He suddenly understood the terrible mathematics.
There was no perfect choice.
Destroying the Engine would kill countless connected realities.
Leaving it active would eventually destroy everything.
"Then we need a third option."
Vale shook his head.
"There isn't one."
"There has to be."
Elias looked at Mara.
She was staring at one of the floating worlds.
In it, two children were running across a field.
One looked like Elias.
The other looked like Mara.
"They're our children," she whispered.
Elias stared.
A different life.
A different universe.
A life they had never lived.
Mara reached toward the image.
It disappeared.
She lowered her hand.
"How many versions of us are there?"
"Countless."
Elias closed his eyes.
Then he remembered the equation.
The Continuity Engine did not require energy to move between realities.
It required information.
Information was the bridge.
What if they removed the information?
No memories.
No coordinates.
No identity.
No observer.
No connection.
The Engine couldn't migrate what it couldn't identify.
Elias opened his eyes.
"I know how to stop it."
Mara looked at him.
"How?"
"We disconnect ourselves."
Vale understood immediately.
"If you do that, you'll lose every memory of the other continuities."
"Yes."
"You'll forget me."
"Probably."
"You'll forget everything you've learned."
Elias nodded.
Mara looked at him.
"Then we'll be ordinary again."
"Maybe."
"And all of this?"
"Will become a dream."
Mara smiled sadly.
"That's not so bad."
The boundary began collapsing.
Vale stepped backward.
"You have thirty seconds."
Elias looked at him.
"Will you survive?"
Vale shook his head.
"I already died thirty-seven years ago."
The answer broke something inside Elias.
Vale smiled.
"Some people are only memories waiting to disappear."
The countdown began.
Mara took Elias's hand.
The worlds around them began fading.
Elias pressed the disconnect command.
Every universe vanished.
For one final second, he saw the original Earth.
He saw the night sky.
He saw the observatory.
He saw Mara standing beside him.
Then everything went dark.