Cultivating In Secret Beside A Demoness - Chapter 799 - : Disappeared In The Blink Of An Eye

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

In a world where magic is long but a thing of the distant past, where humans have the potential of harnessing a dormant power within them, called Battle Force…

A man from modern day Earth finds himself suddenly waking up in the body of Norton Lorist, a youth of noble descent that had been exiled from his homeland in the North by his family to Morante City, the capital of the Forde Trade Union on the pretext of pursuing his studies.

Little did he know what would await him when he receives summons from his family years later to return to the Northlands and inherit the position of the family head…

This is the tale of his life before the summons…

This is the tale of his journey northward and the allies he gathers along the way…

This is the tale of his rebuilding his family’s dominion and keeping it safe from other power hungry nobles…

This is the “Tales of the Reincarnated Lord”.

After 2000 years has passed, the ruthless demon lord has just been reincarnated! But his aptitude at an academy for nurturing candidates for demon lords is, “Inept”!?

Having the capability to destroy humans, elementals, and gods, after a long period of countless wars and strife, Arnos the demon lord became sick and tired of all that and longed for a peaceful world, so he decided to reincarnate to the future.

However, what awaited him after his reincarnation is a world too used to peace that his descendants became too weak due to a huge weakening in magical powers.

Arnos enrolled in the Maou Academy established to find any students that might be the demon lord’s reincarnation, but his powers are too extraordinary that those in the academy couldn’t properly judge his powers, so he’s regarded as an “Inept student”. Being underestimated and avoided by most people there, he recruited a girl friendly to him, Misha, as his subordinate and comrade, and strives to climb to the top of the demon race hierarchy to one day reclaim his former title and status.