Heavenly Jewel Change - Chapter 777

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

I, Hyoudou Issei, am a 2nd Year High school student and my age is equal to the number of years I haven’t had a girlfriend. And, someone like me got a girlfriend! I’m sorry buddies, I will walk the path of becoming an adult before you guys! – That’s how it was supposed to be, but why did I get killed by my girlfriend!? I still haven’t done anything yet! Are there no Gods in this World!? And, the person who saved me is the most beautiful girl in my school, Rias Gremory-senpai. I learned the shocking truth from her who isn’t a God but a Devil. “You have reincarnated as a Devil! Work for me!” Lured by Senpai’s breasts and treats, my life as a reincarnated Devil began. So the “Academy×Love Comedy×Battle Fantasy” starts here with just aggressive and worldly desires!

The Ancient Era has come to an end. Gods, demons and ancient beasts strong enough to rule anything with power and roam free in the universe... All vanished mysteriously.

No one really knows how it has ended and what actually have happened. Some records state that it was the constant war between gods and demons that caused their demise, or even the conflicts they had against members of their own race that ended that golden age.

Greed, pride and selfish motives could have been the catalysts for that ending.

Who can precisely tell what happened? It has been 2 million years since the last record of those times and in this gap of time, other races made their appearances.

Still, those considered God's and Deities of those old times, didn't let their names be erased from history. There are a lot of legacies they've left behind for the new races. Some are already claimed as people make them their sect treasure or family heirloom, but It's speculated that there are lot more legacies left behind that were still not found yet.

This is a cruel world where power reigns, so people do everything to get what they want.

It has to be known, that there were six supreme beings that were above the ranks of Gods and Demons, and they were called True Gods. Dauntless and unstoppable. They attained the peak of power and could only be feared and respected.

Till this day no one has really found any True God legacy, so people have forgotten about their existence. Although, there were a lot of god legacies, since they were constantly searching for the best inheritors for their bloodlines and their teachings. However, it is highly unlikely for a person to fully attain it, because Gods are Gods and humans are mere humans.

Their marks are all over the universe and they are treated with utmost respect until the present age. Still, there is no Deity alive to enjoy such treatment.

This was the era that belonged to various powerful bloodline warriors, the fervorous era where magic powers and warrior energies were the deciding factor of dominance! With endless ardour and unstoppable courage, a grassroot nobody could also shine and live like a boss!