Fantasy Construction

Prequel The human body always has limitations that we can't do despite what we want to do. When we cannot decide on this basis, we can only rely on fantasy. So how would the story develop if, as a person, he could complete this with fantasy? Will it be omniscient and omnipotent? But relying on the narrow realm of human thought, there are too many things in this world that humans dare not even think about, and there are too many things that they cannot imagine in their entire lives. If you don't know everything, how can you be omnipotent?