Arcane Ascent

One day, an all-powerful entity known as the Administrator takes vast chunks of humanity into the Trials, an alternate dimension where they must clear 100 quests or else face extinction. Kai is one of the unlucky ones transported to the Trials, but with a lifetime of health issues, all he can do is struggle to survive. After barely surviving the Tutorial, he ends up living a life of weakness, unable to progress while everyone around else leaves him behind. One day, however, Kai finds a rare item that he believes is the key to fixing his hopeless situation. However, he is betrayed and killed before he can change anything. But in death, he finds perhaps the greatest way to change it all: a Return to the Beginning.