The Warden of The Witches - Chapter 168:

Lyle Walt is a young noble boy and heir looking forward to the day he can inherit his family’s territory. Except around when he was 10 year old, his parents started neglecting him more and more in favour of his little sister, Celes.
On his fifteenth birthday, he is challenged to a duel by his sister to see who will inherit the household and horribly loses, being cast out of his family. Afterwards, he gets treated by the family groundskeepers and receives the family heirloom Gem from him that Lyle’s grandfather had entrusted to him. From there, he begins an aimless journey with his childhood friend and former fiancée, Novem, and the Gem-turned-Jewel that houses the memories, personalities, and Skills of seven of his ancestors.

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

What would you do if you were told you only had five years to live?Aster Mistral, suffering from an incurable congenital “disease” that saps life force out of his every breath, decided to fight with all his might. Waking up into the future, 2,500 years later, he embarks on a quest to find a cure for his ailment!“My target! To find the Panacea on the 1,000th floor of the dungeon!”Together with trustworthy allies, he forges a path of blood and corpses, building his foundation and increasing his level! However, he can’t stay in dungeons all the time, as he has a duty to fulfill.“To raise the human DNA average of the world, the government wants my seeds?!”Follow Aster on his laidback journey of fighting monsters, courting girls, escaping adversaries, and discovering secrets about himself!

After catching his wife in bed with another man, Alex died of a heart attack—only to be reincarnated in another world with a MILF System in the frail body of Asher, a sickly teenager.Betrayed and furious for his wife's infidelity, he vows to punish unfaithful women and seize control in his new world. But there's one problem: in this world, women reign supreme over men, blessed with overwhelming strength by the goddess herself. Outmatched and underestimated, Asher refuses to accept his place at the bottom. With the MILF System at his side, he’ll do whatever it takes to shatter the hierarchy and claim absolute dominance—even if it means conquering every woman in his path until he reaches the heavens to claim the ultimate MILF herself: the goddess.But can he rise to power in a world where men are nothing more than playthings?Find out in this wild, boundary-pushing saga!Disclaimer: This book contains intense sexual content and themes of incest. Reader discretion is advised.