100 Days Of Escaping My Wedding - Chapter 71 - The Difference Between Insiders and

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

Morca, a mere mortal who dared to ascend to the heavens and claim his place among the so-called gods, ultimately failed. Not because of his own weakness, but because he was forced to watch his beloved little brother be slain by the Heavenly Titan Court’s envoy.In that moment of grief and distraction, the Heavenly Titan Court’s envoy, realizing they could not stop him through conventional means, placed upon him the Curse of Eternal Doom, a fate that ensured both the heavens and the abyssal realms would relentlessly pursue him until his existence was completely erased.And it nearly worked. His soul teetered on the brink of annihilation, moments away from being extracted.Then, everything turned blank.===Morca, after 'transmigrating' into the world of Eden, awakened a powerful system that granted him a unique SSS+ talent. This talent allowed him to grow stronger through battle and killing. With the system’s aid, he advanced rapidly, eventually ascending into the Oblivion Realm–a place beyond the known and the unknown. There, he uncovered a great secret that no one had ever imagined existed.During his journey to power, he met Neo Laura, a companion bound to him by the system.===The birth of the Child of Nihility. An entity destined to shake the heavens, the abyssal realms, and even the oblivion realm itself.===Everything in existence has an opposite. So, if nothing exists beyond the darkest space… then shouldn't its opposite be everything?Beyond the endless void outside the universe lies the Oblivion Realm, home of the Nihilians.They are described in a single word, Catalytic.They grow quickly. They Course destruction just as fast.Shrouded in mystery, their existence is a paradox.

Escaping from the wedding she dreaded with Crown Prince, Aed Ruad, Princess Anastasia ended up becoming the captive of the Lore's most dangerous man, Prince Ileus.