Eriri heard Izumi's words and immediately nodded.
"I understand!"
"I'll go!"
She had naturally sensed what had just happened. If it weren't for Katsushika Hokusai's approval, there was no way she could have fused with the Spirit Origin so smoothly.
Going over to thank her was only natural.
Seeing how sensible Eriri was, Izumi didn't say anything more.
From that point onward, all the Heroic Spirits finished registering.
Izumi was finally ready to begin this massive war.
Looking at the arena now filled with Heroic Spirits, his heart stirred with excitement.
With a single step, he appeared high above the venue.
The moment he showed himself, countless gazes turned toward him.
The most displeased among them was Gilgamesh in his Archer form. After all, Izumi had stabbed him twice before.
If he were strong enough, he would have drawn his sword on the spot.
In contrast, the Wise King version of Gilgamesh looked at Izumi with great interest.
He already knew what had happened to his other self and didn't care much. Instead, he was deeply curious about this man.
Izumi looked down at the gathered Heroic Spirits and spoke.
"O Heroic Spirits from every era of human history."
"Now, fight to your heart's content."
"Let us witness which team will claim the final victory."
The moment his voice fell, the surrounding Heroic Spirits vanished.
Only two teams remained in the arena.
The rest were instantly transferred to the spectator stands, becoming the audience for this grand battle.
For Heroic Spirits, fighting in front of countless other legends was exhilarating.
Excitement spread through the crowd.
The two remaining teams burned with battle intent.
Without even waiting for a signal, the war erupted.
Both sides rushed forward with their Noble Phantasms drawn.
BOOM!
The thunderous clash echoed across the entire city of Fuyuki.
High above, the wills of Alaya and Gaia descended, suppressing the destructive shockwaves.
If they hadn't, Fuyuki might have been wiped off the map.
At the same time, Izumi reinforced the surrounding space to prevent any catastrophic explosions.
Every Heroic Spirit grew more excited.
After all, those who could become Heroic Spirits were rarely strangers to war.
This kind of battle was irresistible.
Izumi returned to his seat and watched happily alongside the others.
He also released Ophis and the rest from his inner world.
How could he forget them during such a spectacle?
As the battle unfolded, everyone watched with fascination.
The dazzling displays of Noble Phantasms left Illya and the others in awe.
The war lasted an entire week.
In the end, the final battle was between the golden team led by Gilgamesh and Ozymandias, and the team led by Scáthach.
However, Gilgamesh's team was completely suppressed.
No one knew where Scáthach had gathered her Heroic Spirits, but every single one possessed god-slaying attributes.
They crushed the golden team mercilessly.
The result shocked everyone.
No one had expected the undefeated golden team to fall like this.
Even Izumi felt speechless.
It almost seemed like Scáthach had been bullying them… though there was no proof.
She must have predicted this outcome from the beginning.
Seeing that the result was already decided, Izumi lost interest and left Eriri and the others behind.
He headed straight to the Throne of Heroes.
Standing before Gaia and Alaya, he spoke.
"Alright, things here are temporarily settled."
"Let's begin merging the worlds."
World fusion would take time, and Izumi had no intention of waiting any longer.
The Heroic Spirits could continue their fun on their own.
He had already obtained everything he needed.
Hearing this, the two girls exchanged a glance and nodded.
Without hesitation, Izumi took out a card.
A World Fusion Card.
The moment he held it, the entire world of Type Moon began to tremble violently.
Gaia and Alaya immediately understood.
They placed their small hands over the card.
In the next instant, brilliant light erupted.
The radiance spread from the Throne of Heroes, covering the planet, then the universe.
Even the neighboring world of Fate/Grand Order was enveloped.
Across the universe, powerful beings looked up in shock.
The Alien God, the Magicians, the will of the Moon—every existence was stunned.
Even Scáthach and the others stopped fighting, overwhelmed by the terrifying power.
Scáthach alone understood what was happening.
A beautiful smile appeared on her face.
"So it begins."
"I look forward to seeing how far you will grow."
Izumi had already reached a level she needed to chase.
And he was still advancing.
How strong he would become… she could only imagine.
Inside the Throne, Izumi felt an endless stream of world power pouring into him.
It fused with the world within his body.
His inner world had already been complete.
Now, as the Type-Moon world merged, cities began appearing one after another.
The girls living inside his world were startled by the sudden changes.
Starting from the central city he had created, the land expanded outward.
Countless houses and humans appeared.
Those forcibly integrated felt nothing strange.
Everything seemed natural to them.
Watching the process, Izumi smiled.
"Good. It'll take a few months to fully complete."
"You two should prepare as well. Welcome your new home."
The two girls nodded excitedly.
Without hesitation, they moved the Throne of Heroes into his world.
Seeing this, Izumi also transferred the Root.
As for the knowledge stored within it, he had no intention of touching it for now.
He was already its master.
Any power from this world could be obtained instantly.
But he no longer had a strong need for it.
In the future, he could slowly select useful abilities and integrate them into his own authority.