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

The child didn't understand what was happening as the ones who brought him into this world handed him off to a strange man as though he were a piece of fruit being traded. It didn't make much sense to him: why did his mother and father want to get rid of him, but he knew the reason as soon as the stranger handed a bag of gold coins to his avaricious parents.

To the boy born to slum dwellers, only a few years into his youth, he understood what happened–he knew that his life was less valuable than a sack of money to his parents.

["I've seen the kinds of things my old man would do for a few coins, same for my mother. Honestly, I didn't feel betrayed–they raised me to appreciate money above all else, so back then, I believed they made the smartest choice selling their only son."]

The Boy of War