...enter the"Endless Library of Other Worlds".

<Tl;dr - This is where you pick the general theme of your adventure. This determines the general rules of the world.>

[Author's Note - Think of this section like a "New Game" menu of sorts where you can come back and start another story by using a "library card" item that'll be withbyou when you go to another world.]

You enter the door and find yourself in a vast library. You look around feel like this place goes on forever. You look up and see that the library is divided into sections with each one being dedicated to a core principle that ties everything in it together. You see a sign for a section dedicated to Literature, one about Movies and TV Shows, one for Anime, Manga, and Manhwa, one for Animation and Cartoons, and one for Original Works. There is even a desk with a computer, a typewriter, and a little plaque on a stand that says, "For the truly creative and imaginative minds to craft new worlds".