When demons came into existence, they became a force outside God's original creation.
They were not guided.
They were not balanced.
They evolved freely.
And so, God intervened.
Within the royal bloodline of humanity, He implanted a seed — a safeguard.
A warrior who would oppose the demon race.
A being born to restore balance.
The queen fell pregnant.
To God, there was only meant to be one child.
One chosen.
One protector.
But fate… intervened.
On the night the seed was planted, the king lay with his wife once more.
And something impossible happened.
A second life formed.
Not divine.
Not planned.
Not created by God.
An anomaly.
Two souls grew in the queen's womb.
One chosen by God.
The other… born from coincidence even God did not foresee.
Twins.
They were born beneath thunderous skies.
The king named them:
Arthur — the firstborn.
Zeus — the second.
Brothers.
Born for war.
Arthur inherited the throne by right.
Zeus inherited… nothing.
Yet both possessed power beyond human comprehension.
They trained together.
Fought together.
Conquered battlefields side by side.
When demons invaded, they stood as humanity's shield.
Arthur — calm and righteous.
Zeus — fierce and brilliant.
They were unstoppable together.
But as time passed…
A shadow grew in Zeus' heart.
Arthur was praised.
Arthur was chosen.
Arthur was heir.
Zeus… was always second.
Jealousy slowly poisoned him.
And then…
He met her.
A demon.
Scarlet.
She approached him first.
A contract, she proposed.
Power in exchange for alliance.
Zeus accepted.
But what began as a contract… turned into something else.
Understanding.
Trust.
Love.
For the first time, Zeus felt chosen.
Not second.
Not overshadowed.
Loved.
And so…
He chose her.
Over humanity.
War erupted once more.
Brother against brother.
Humanity against demons.
Arthur stood at the front of the human army.
Zeus beside Scarlet led the demon forces.
The world burned.
Battles lasted years.
Both sides suffered unimaginable losses.
Until the final confrontation.
Arthur stood alone.
Across from him—
Zeus.
And Scarlet.
Even Arthur understood.
Against two beings of that level…
Victory was impossible.
Still, he fought.
The sky shattered.
Mountains collapsed.
Oceans split.
Arthur pushed himself beyond his limits.
But eventually—
Scarlet pierced his heart.
Blood filled his lungs.
His body weakened.
Zeus watched silently.
"…Brother… stop."
Arthur smiled faintly.
"…Not yet."
He began chanting.
At first, they thought it was meaningless.
But then—
The sky darkened.
A domain formed.
Thunder Domain.
Unlike anything the world had ever seen.
Dark clouds heavier than gravity itself.
Lightning storms capable of erasing continents.
Electricity filled the air like divine judgment.
This wasn't power.
This was annihilation.
Lightning struck randomly.
Knights died.
Demons died.
The domain spared no one.
Zeus tried to escape.
Impossible.
Scarlet raised shields.
They shattered instantly.
Arthur stood at the center.
Bleeding.
Smiling.
"If I fall… we fall together."
Lightning descended.
The world turned white.
And then—
Silence.
Everyone inside the domain perished.
Arthur.
Zeus.
Scarlet.
Knights.
Demons.
All gone.
The war ended.
But the story… didn't.
Eons passed.
Arthur's soul drifted through time.
Then—
He was reincarnated.
Into a modern world.
His memories sealed.
His power locked away.
He lived a normal life.
He laughed.
He loved.
He married.
And eventually…
He had a son.
Kros.
Kros wasn't born by coincidence.
It was fate.
Because one day—
The sealed blood of Arthur would awaken.
And once again…
A son would rise
to finish the war
his father ended.