DelzGB

[The first arc is about obtaining the system, so please be patient and give the story a try! I promise it will be worth it.] 
In a world where gods have erected a worldly monument, the "Tower of Yggdrasil," people are drawn to its impossible challenges. This towering structure pierces the heavens, concealing both unimaginable beasts and priceless treasures within its unforgiving depths.

Enter the realm of "Adventurers" – daring souls who ascend the Tower's brutal floors in pursuit of glory. The fortunate ones secure the sponsorship of gods, gaining their Blessings to wield divine power in the face of peril. Yet, amidst this celestial lottery, Bastian, an unfortunate adventurer, remains unblessed, navigating the treacherous terrain with only caution and cunning.

As Bastian teeters on the brink of death, a mysterious voice intervenes, offering him a lifeline: [Prometheus System Awakened]
Becoming a chosen “Invictus”--a person chosen as the champion of their god, he finds himself in the ranks of legends, having to learn all too quickly to adjust. 
He must defy the odds, unravel the mysteries of Yggdrasil, and face the trials that await beyond the clouds, making either ally or foe of other Invictus, and the gods that dwell in Yggdrasil.

Tower of Yggdrasil: From Zero To Godhood

Through gritted teeth and a growl of pain, the Invictus of Hercules grabbed onto the abyssal skewer that stuck through his eye. It was a feat too gruesome to be done, yet, with a single tug, the object was ripped out as an abundance of liquid leaked from the man's destroyed socket.

All but surely, even as one of divine might, such wounds would be fatal to any beings tethered to flesh. Despite that common weakness of humans, the man persisted.

"Just which god is it that empowers you? A god of death? Of life? That is the only explanation for this unnatural tenacity," Nemesis questioned.

The man stood tall like a pillar of sturdy stone holding up the world itself, even as blood seeped from his mortal wounds, "I am not powered by any god–I am no champion, but to humanity itself."

Inevitable Darkness