Shadow's Oath - Chapter 87

“Legend had it that in the deepest part of the oldest galaxy, there was a door as red as blood and fire.

Legends and myths, darkness and light, countless stories passed through this old door.

The Door of Constellation that overlooked everything would warn the sky and earth, sending darkness back to where it belonged.”

In the heavens, where the Divinity resides, there exists the records of life and death.After the fall of the Gryghori onto the earth, the land of man is corrupted. Abominable creatures never before seen are born of the consummation of heavenly and earthly beings and spread across the land to further corrupt the world.A thousand millennia later, humanity has created civilization once again, based on the knowledge left behind by these Fallen Angels.However, in this new civilization,Man is not alone.Nero is thrown into a world infested with demons, the souls of the dead Nephilim, and abominations of all shapes and horrors, when he stumbles across the very eye of the Divine.A story that preludes an apocalypse and the existence of slumbering evil that threatens to envelop the earth begins.This isn't a story of fulfillment or triumph.These are the very Records of the beginning of the end.Welcome— To the Land of the Abominations.

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

- Description from Novelupdates

Takashi Nakamura is an ordinary student, constantly targeted by bullying from his classmates, living a life marked by loneliness and disdain. When he and his peers are mysteriously summoned to a new world, their hopes for change quickly fade. Deceived by everyone, he is accused of crimes he didn’t commit and executed by his classmates who planned everything from the start.Reborn as Pandora Aegis Oblivion, the new Demon King, Takashi no longer cares about the consequences of his actions. With immense powers at his disposal, he embarks on a journey of chaos and destruction, determined to plunge not just the kingdom, but the entire world into absolute chaos.In a universe filled with shadows and magic, Pandora transforms into an unstoppable force, a symbol of despair and power. As she progresses, she confronts relentless enemies and the reality of her new role. In her quest for total destruction, she will discover that every act of revenge comes at a cost, and that even amidst chaos, echoes of the past can resurface, challenging her resolve.