Top-notch Master Masquerading As Cannon Fodder Female Companion - Chapter 946 - Qin Murong, I Am Tan Mo  

In a world where everyone is undergoing their profession's transition, I've surprisingly awakened to two professions.Moreover, I've also awakened a defiance lifestyle profession.Preserve high-quality items? I'll just synthesize them.Preserve high-quality skills? I'll synthesize those as well.Preserve high-level pets? I'll keep synthesizing. Wait, why is this beast-girl so large after the synthesis?Let's start by synthesizing three “Skeleton Summonings.”Synthesize into—The “Undead Army.”Now, let's synthesize three Dark Wands.Synthesize into—The “Death's Scepter.”In the grand interspecies gaming contest of the universe, can we, humans of the Solar System and Earth, ascend to an even broader stage?......

“There are no heroes. In life, the monsters win.”

...

In 2106, [Mayhem Online], a fully immersive VRMMO game, was released. Soon, it dominated the world's economy when people could exchange the in-game currency with real-life currency and vice versa.

In the year 2107, Flynn Grey, a 22-year-old college dropout with an ambiguous history, joined in the fray of billions of people that had already started playing [Mayhem]. Hoping to uncover the game's secret and earn a fortune, he spent months on adventures without fruitful results.

For better or worse, Shura, Flynn's in-game character, ends up in a great Wyvern's den, acquiring a hidden class and a monstrous race. Join him as he defeats his past and paves his way into becoming a true legend in both worlds.

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