I start speaking quietly while approaching the Ancestral Dragon.
“You, the first demon king, killed a hero and destroyed my hometown, starting a dark age.
No one could beat you, and you destroyed a lot of countries.
That future, that destruction would have started here.”
That’s the original future.
The shape the future is supposed to have.
“But I reject that future.”
Even if it’s a sin to change the future.
Even if breaking this taboo is unforgivable.
I got here after a very long journey.
Eventually, the breath stops, and instead a lot of blood is spewed out of the Ancestral Dragon’s mouth.
I guess it spewed so much breath that it burned its own throat.
And yet, I took it all and I’m completely unharmed.
“Are you done? Then… It’s my time.”
It’s my chance to take down the Ancestral Dragon.
I turn my attention to the atmosphere around us, and see it’s immensely rich in magic energy, probably because the Ancestral Dragon fired its breath so much.
I use it all as external magic energy so I can activate my technique.
I place the palm of my hand on my chest and start formulating a technique.
Woosh… Magic energy around me whirls, and gathers in my hand.
My whole body is sparking…! Discharging magic energy.
I had no talent, so it took me a hundred years to get here.
“W-what… Is that power…”
The face of the Ancestral Dragon twists with despair.
It’s an intelligent being, so it understands the gulf between our powers.
“…I-impossible! Impossible, impossible, impossible! I-I am a demon king! Demon king! Demon king!? I should not lose to a puny human that is not even a hero! I-I cannot end here!”
“Yes, you’re actually right.”
I walk in front of the Ancestral Dragon and touch the tip of its nose.
“There aren’t any humans who can end you in this age.”
There is no record of the Ancestral Dragon being slain the first time around, just a pile of defeats.
Even in the end, humans couldn’t defeat it.
“So I’ve been thinking about how to kill you for the past hundred years.”
The answer is simple.
Those words are enough to end this demon king.
“W-what are you…!?”
A giant magic circle lights up beneath the Ancestral Dragon, and its body starts to violently shake.
The time of the body of the Ancestral Dragon begins to advance more rapidly.
“Time is power.
No matter how strong you are, no living being can fight back against time.”
The time of its body flows at a very high speed, and it visibly withers.
And since it’s stuck in the stopped tree, it can’t escape this time magic.
Damn you damn you damn you! Is that power time!? Time!? It can’t be.
It can’t be, it can’t be, it can’t be, it can’t be, it can’t be, it can’t be, it can’t be, it can’t be! How many taboos did you…!”
The resentful screams of the Ancestral Dragon echo.
It knows it can’t escape its death.
I look at those eyes filled with hellish hate one last time, and smile.
It’s thanks to you that I became this strong.”
The Ancestral Dragon rots, turns to bones, and then to ash.
The weathered dragon bones turned to dust glitter as they fly into the evening sky.
Nothing remains of the Ancestral Dragon, and nothing moves in this battlefield except me.
The first demon king has been slain.
I finally take a breath.
Looks like I was actually pretty nervous.
I gag, and blood comes out of my mouth.
(…I pushed myself too much.)
I was firing around great magic with this body that’s still not used to using magic in the first place.
This was a lot for my body of this time to take.
My head hurts a lot and I feel very dizzy.
Sweat pours from my entire body and I stumble, finding it very hard to put any strength into my muscles.
The demon king that once destroyed my hometown was terminated here.
Around me is the carved earth and countless monster bodies.
Only I can still move here.
In my youth, this monster army caused me so much despair, but I guess I became an even bigger monster.
You have become the most powerful ‘monster’ in the world.”
I remember something that was said to me in the future, and the fear the Ancestral Dragon had in its face in the end.
(…I don’t mind being a monster.)
I finally managed to protect what I wanted.
My hometown, my childhood friend, everyone…
That tragic future was changed by my hand.
(…Guess I’ll go home.)
To the hometown I once lost, with people dear to me.
To a peaceful time when everyone is smiling.
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