"Worldbuilding," in English, is a term used in fiction to describe the creation of an imaginary world in which the fiction takes place. The idea is to make the world consistent and logical to provide a level of verisimilitude, even if the rules of how the world works are different than our own.
I have attempted to find a translation using Google Translate, but only get translations of the words individually, such as construction mondiale or construction de monde, both of which refer to buildings. Switching to building the world gives me construire le monde, as expected. However, googling these phrases shows they are not used in the sense of "worldbuilding" as defined above.
I cannot find "worldbuilding" (or spelling variants) in any Googleable English-to-French dictionary, either. Any suggestions by other speakers (e.g. la création de monde) do not find widespread use.
I wish to translate a simple sentence such as "I adore the worldbuilding in this webcomic."