I, the All-Class Magus, All My Awakening Skills are LvMax - Chapter 82 - -Desire Demon

The mortal body, metamorphosis, longevity, immortality, and eternal life. These five realms, step by step, reveal themselves in front of you. As a normal person, how can one try step by step to reach and open the door to eternal life?

Between the heaven and the earth lies the mortal body, the mysteries of metamorphosis, freedom of longevity, the power of immortality, and the hope of eternal life. A story filled with endless new magic, a new world of immortal styles, people, demons, gods, fairies, magic, kings and emperors. A world of love and hatred, revenge, and mystical battle, all in “Eternal Life.”

- Description from Novelupdates

In a land ruled by vile monsters, where death is common and life is cruel, one outcast endeavors to have it all. When misfortune drags the odd goblin Stryg from his forest home and into the ruthless city of Hollow Shade, he must try and adapt to a world that only sees him as a dimwit savage.Stryg finds himself embroiled in a school of magic, where an aristocrat's smile is filled with deceit and the simplest of remarks may lead to death threats. Yet nothing will stop him from aspiring to his beliefs of glory: power, honor, and food with salt.But as Stryg navigates through the muddled grey waters of the Ebon Realm, he will learn that some monsters lurk everywhere.

Rejected at birth for lacking Ka, the divine essence that flows through all living beings, Alioth seemed cursed from the very beginning of his new life.When the heavenly kingdom of the gods collapsed, the world was consumed by Azoth: an abyssal fog that mutates every living thing it touches.Humanity's last refuge became Caelestia, a colossal floating citadel built amid the ruins of the gods' former home.Here, lineage is everything. Those who possess superior Ka can demand absolute obedience from the weak. Without it, one becomes fragile and unable to wield magic.But Alioth harbors a hidden gift, born from his past life: the power to bestow names drawn from the myths of his old world.Zeus, Odin, Excalibur, Gáe Bolg. Everything he names acquires the legendary traits of its mythical counterpart.But will this power be enough to survive and decipher the mysteries of this world?Alioth doesn't know yet, but he's determined not to waste his second chance.

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