If Ты could create a fandom/world with absolutely no limits или barriers, what would it be about?

It would be fantasy. I've got a few 'worlds' in my head (I want to be an Автор so I create fandoms a lot) but there are two worlds that I've developed most: one is a Фэнтези sword and magic type of story and the other is a futuristic, post-rebellion type of story.