The Demon King of Destruction

Prologue: The Beginning.

1.5 Million years ago, long before there was a story of Lucifer and Azazel rebellion against the God of Bible and even longer before the birth of a young man known as Issei Hyoudou there was a story of a King and the creation of peace.

In a long forgotten era known as the 'Eternal War' era, a violent period of time where all living being wage war against each other for a million years to earned the right to hold the world's 'Crown', an age where chaos, suffering and death endlessly feasting upon the four living realm like a starving beast there was an entity said to be the strongest among all living being, a man that was able to unite the once divided Demon race.

He is, Aegeus Von Dienricht, the Demon King.

Unlike many other Kings, the power held within the world's 'Crown' and having the whole world in his hands did not interest him in the slightest.

For the world, he wished only to see a world without war, without conflicts and endless suffering, a peaceful world where people could choose the path of their life and seek for their own happiness.

But, he knew that without a victor, there would not be any unison or peace.

The Kings hide their endless greed behind their passionate propaganda, the Knight's hide their thirst for blood behind their false heroism and for their own glory, their own twisted satisfaction, the people's cries for peace and scream for an end were silenced.

Seeing those unfolded before his eyes, Aegeus held deep resentment to the foolish Kings and the heartless Knights.

Thus, after he succeeded in uniting the Demon race, rebuilding its Kingdom and gathering a massive Military strength, he set his gaze to the entirety of the world.

During his reign as a King, the once fragile and weak race became untouchable, in just several hundred years the Demon Army managed to strike fear into the hearts of many Kings.

Even so, only after over three thousands of victories did the Kings of Morthal, Malakith, Deus and Warbeast finally realize the terrifying strength and brilliance of one man, the Demon King, Aegeus Von Dienritch.

So much so, that even his presence alone in the battlefield could turn a losing battle into victory.

Upon realizing that Aegeus not only hindered their ambition but also slowly won the war, they used many ways to try preventing Aegeus from ever reaching whatever his goal might be.

Assassination through various methods, attempts at triggering Coup d'etat through various paths and even forming an Alliance, all for the sake of defeating a single mind and body.

Eventually, the outcome was nothing but futility.

Another thousand years passed and the situation for other races worsened, in their eyes Aegeus became an unstoppable force and they started to become desperate.

Then, that day eventually came. The last resort to defeat King Aegeus.

The King of Malakith (Angel), Warbeast (Yokai), Morthal (Human) and Deus (Gods) know how prideful King Aegeus is about his power and ability, thus, taking advantage of that, they ensued a challenge.

A grand battle, Aegeus against the three Kings, if he wins, the world is his and if they win, Aegeus dies and the Demon would return to their previous condition.

Weak and fragile.

Though many see it as an obvious trap, Aegeus sees it as nothing but a served opportunity and despite many of his Generals trying to warn him, Aegeus simply said.

"The end has presented itself before me, It would be foolish not to greet it."

And Aegeus accepted the challenge.