I am the Demon king, but why do the Goddesses favor me? - Chapter 37: Paisley

Hundreds of years ago, Human, Celestial Clan and Demon Clan lived together on the Origin Continent. However, a great war broke out between the three races. Shan He, the leader of Human, had discovered a catalogue of methods to forge Divine Weapons. With this catalogue, Shan He led Human to defeat the other two clans and expelled them from the Origin Continent.

The peace did not last long. After the passing of Shan He, the once Glory Empire collapsed. Various forces of Human fell into a long period of wild war for the Divine Weapon Catalogue, but the catalogue was lost during the war.

The Demon Clan took advantage of the internal strife of Human. Under the lead of their new lord, Fen Tian, the Demon army invaded the Origin Continent violently.

Human soon lost a large portion of their territory. At that moment, a mysterious hero suddenly appeared on the battlefield. With a legendary Divine Weapon in hand, he severely injured Fen Tian and forced him to retreat. The united Human army chased the Demon army across the strait and to the Two Realm Plain on the Tranquil Continent.

Once again, the various forces of Human started wildly searching for the Divine Weapon Catalogue…

- Description from Novelupdates

Eren Idril died as an old, decrepit, and piss-poor adventurer by the maws of a D-Rank monster. He had a lot of unfulfilled dreams and desires that couldn't see the light of the day after the light in his own eyes died down.

But fortunately for him and unfortunately for the world, that wasn't his end. Eren was somehow dived back in time when he was a mere teen, attending Lionheart Academy for adventurers.

When life gives him a second chance, Eren decides to exploit it to its fullest. Experience his vile deeds as he partakes in them without feeling the slightest bit of hesitation.

In this world, Planet Earth had undergone great changes and humanity is faced with extreme danger. Luckily, humans have something called the Heaven Dao software.

“In the depths of eternity, where darkness and light entwined, the universe was born from the dreams of the gods. From the celestial harmonies of creation to the discordant melodies of destruction, the cosmic symphony echoed across the expanse.Within this grand tapestry, a world emerged, forged from the essence of duality. Earth, a terrestrial haven, became the stage for an epic drama, as forces of creation and destruction converged. The fate of the universe hung in the balance, as two goddesses, Stella and Khaos, wove a narrative of light and darkness, life and death.Their story, a testament to the eternal dance between opposites, would give rise to a new era, one where humanity would inherit the earth, and the delicate balance of the cosmos. Join us on a journey through the ages, as we explore the celestial ballet, the birth of life, and the eternal struggle between creation and destruction.”