MTL - Back To 2005 - Chapter 1250 Young people just can't handle it

“They only call me mad because they're unable to comprehend me.”After recovering from trauma, Dan was just about to reconnect with the world when some cursed force yanked him into another world without warning.He became, Jules Evanava, a similarly traumatized minor character from the novel, Aftermath of Destroyed Worlds.Jules was now the heir to the strongest clan in the world, thanks to their esteemed, world-balance-altering artifact—but there were thorny strings attached.On the same day he arrived, he was thrown into a mission meant to end with his death.Yet he survived, seizing the Archangel of War’s power in a gamble with death—high risk, higher reward.Blood Manipulation, the Crimson Sigil, War Forged—a sentient sword—and Bloodlust Control were just the beginning. There was more to come. So much more.And with each new power and growth, something in him cracked. Sanity frayed, slowly but surely, as Jules danced closer to the edge of madness.Now, with enemies in his own clan and chaos rising across multiple lands—and even space—Jules must navigate a brutal world on the edge of collapse.Armed with the novel's knowledge and his growing abilities, Jules was going to survive it all—even if he had to become the very madness they struggled to understand.

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

“Kill Hamyuts Meseta”

A story about a world where all dead people become “Books” and are housed in a Library. The boy named Colio Tonies had his memories taken and a bomb transplanted in his chest. His life’s purpose is killing the world’s strongest Armed Librarian, Hamyuts Meseta. But, one day he gets his hands on the “Book” of a beautiful princess and falls in love at first sight. Furthermore, that love will cause Colio to get involved in a grand scale battle…