The Simple Life of Killing Demons - Chapter 9Book 10:

On her wedding day, she was humiliated; her status as the legitimate wife was instantly changed into that of a concubine.

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 originally thought this was a world like an ordinary urban novel…Drawing comics by myself, traveling is pretty good.
But tell me, what happened to this magician called “Emiya Kiritsugu” who jumped on my face?
Who changed the settings?
Currently involved in the content of “F/Z”, “F/SN”, “Fantasy Carnival”, “The Emiya’s Meal”, “The Holy Grail of the Imperial Capital”, “FLA”, “Elmello II Event Book”, “FGO”, “FE”, etc.
Others related to “JOJO’s Bizarre Adventure”, “Rebellious Lelouch”, “Persona 5”, “Attack on Giant”, “Death”
“FGO”, “FE Series”, “FA”, “FSF”, “Cangyin”, “Magical Girl Illya” will be involved next…

- Description from novelbuddy

When Lu Yuan woke up, he found himself ten years in the past.Lu Yuan then made the choice no one understood.He liquidated his family fortune, dumped billions into “worthless” relics, and earned the title of the biggest idiot heir alive.But no one knew that three months later, the Global Awakening would arrive. Humanity would evolve. Alien horrors would invade. And cash? Just colored paper.Armed with knowledge of the next decade, Lu Yuan began his insane preparations. He spent billions to claim treasures no one else valued: the ancient Bodhi Tree that granted billionfold talent; the complete Dao De Jing; a farmland where a landed meteorite held a celestial sword embryo.The world mocked him as a prodigal heir. The antique world whispered about a mysterious buyer.The world laughed at him until the Awakening came. Then they trembled. Lu Yuan was invincible across the earth.Beneath immortals, none can defeat me. Before immortals, I’ll trade life for life.