The Tycoon's Enchanted Mermaid - Chapter 86 - : Preparing to Sell Pearls

After crossing over into a world of magic, Dean Bruce was mistaken for a powerful sorcerer. Though he initially intended to sternly refuse the beautiful woman’s request to become her mentor, she offered him far too much to say no!Completely clueless about magic, Dean Bruce had no choice but to make up spells on the spot. However, when he saw the astonishing power unleashed by the beautiful woman after chanting his random incantations, he was stunned.The spells he had carelessly invented… could they really comprehend magic and even forbidden spells?As Dean Bruce ascended to the pinnacle of magical prowess and became the Archmage, he candidly answered a reporter's question during an interview with the Alliance: “ never understood magic. I just made up a few incantations, that's all.”People were in awe of him—this, they believed, was the true humility of a Grand Archmage!

He defied the heavens once, he returns to do it again.In a past life, he was Xie Wuchen, the heretic god of cultivation. A rebel who shattered divine law, betrayed the celestial order, and vanished in a blaze of infamy.Now, he is Lan—a crippled prince in a world ruled by mana and noble bloodlines. His mana core is broken. His name is a joke. His existence, forgotten.Until the rain falls.And something awakens:[Forbidden Arts Synchronization: Complete][Elapsed Time: 16 years, 10 months, 15 days][Memory Restoration in Progress…]The soul of Heaven’s greatest traitor has returned with a hunger far greater than revenge.And he plans to do more than ascend the magical hierarchy. He will annihilate it.This time, he will forge an empire—not of nobles or spellcasters, but something this new world have never known—Cultivators, trained in arts banned by gods and feared by men.Those who mocked him will kneel.Those who ruled by birthright will burn.And the heavens, once again, will tremble.Magic rules this world.But cultivation will conquer it.

In novels with a stud there is always a Senior Martial Brother like this:

In the early stages of the novel, his innate talent is high, his cultivation is good, his appearance is handsome, and he has an intelligent, cute younger Martial Sister as a fiancée.

In the middle stages of the novel, he is caught unprepared and defeated by a young disciple (the protagonist) in the sect who’s hardly remarkable at all. From then on, he falls from his godly altar and loses his brilliance. Even his young Martial Sister leaves him for someone else.

In the late stages of the novel, he continues to turn dark, going down the Demonic Path and becoming the major villainous boss. However, the protagonist still ruthlessly defeats him and his soul is eternally sealed.

Once Qin Mo opened his eyes, he discovered that he had become this Senior Martial Brother.

- Description from Novelupdates