Any novels that take place in "Boundless Universe"?

Hi, I have noticed a lot of posts about Lord Fifth so I read about it on this wiki: ;

There is a mention about Boundless Universe and All Heaven`s Universe.
It seems that Boundless Universe is some kind of higher realm/plane?
I have noticed that few stories takes place in "fake" universes? 
Renegade Immortal(I took a look at few spoilers which explained a bit about this "fake" world or something), ISSTH and possibly other stories. 

I need more information about that. 



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