Dark gods summoning

There was a legend of demons ruling all ten realms.the leader of the demon was named uaang tosamaki .he suffered pain and because of his death of his teachers who he took as his parents and wanted to reign havoc on others and one of the lords of the nine realms was the brother of his teacher yang uaang then challenged him to a battle thinking he was the one who slaughter yang the two demon clash in battle the brother of yang was known as the destroyer Shinto Shinto summoned a magic circle from the sky and a red glowing plasma came but with one word uaang shattered the red plasma he said "DISATERR"and Shinto was shocked then with uaang two blade slaughter him and stabbed him eight more times then out of nowhere a golden hair hero stabbed him and said "the reign of darkness has end .And uaang cockyly said and why in hell would you think that and summoned a purple sword and jump upon the face of the moon and raise his sword and he use the magic of red plasma.shinto used against him.And as calder summoned a force field not to protect him but everyone with himand shouted heavenly god's dragon and as the name said he ride ontop of his dragon his sword had become gigantic and glowing but with a word "DISATERR" .Then the sword broke

andthe hero said in all life nobody would have survived three seconds against me and uaang said and no one has stand even a glance of my eye by the word. "DISASTER"you should have been dead

The hero smiled and said that not only what you got.uaang said sorry but and yeld red lighting and calder summoned a golden shield and jump to smash it.

Then a voice saying caldeyas, caldeyas.The boy immediately woke up . The teacher with sadness said why are you sleeping through the agamatation class.I have no magic rather an ambition to learn it so while would I forced myself.But the reason I walked into the class because upon all the teacher you knows the history they said 7000 years from now I show bestow my grace upon my realm

I shall slutterd everything that lives

Blood shall flow like water

Bone shall crumble as if it was ruble

And flesh shall be tore as if it was paper

And I will return

So teacher kusakabe is it through uaang shall return upon this world once more

The teacher slowly said yes