Legend's Regression

Millions of Humans worldwide have transmigrated to another dimension. Inside of an enormous, mysterious black tower. A world where several universes and dimensions intersect. 「 'Tower of Trials' has selected all suitable candidates from Earth. 」 I spent ten years in that tower, crawling my way through dirt trying to make a name for myself. Despite being one of the so-called strongest person among all other players, I wanted another chance at this. I made so many mistakes, I could have done so much better. Several years later after my arrival in the tower, I became a man who had lost everything just because of a single mistake. After living a life that fell to pieces, I got another chance by returning to where everything began. Returning back to the past, I attempted to climb the Tower again. Possessing a very unique ability, I will use that, with all the knowledge I know about every single thing in the tower, take over everything faster than anyone possibly could! Disclaimer: I do not own the cover. (Source: Pinterest.)