We discussed creating a World for a series of novels spanning multiple alternate Universes here:
How The Universe Got Its Revenge by K. Eason has a title that seems as if the novel would be a model for how to apply the considerations highlighted in those two posts.
I read the novel with great anticipation, and was just a bit disappointed because of my expectations.
The novel is not disappointing. It's well done, for what it is -- a lot of combat scenes glued together with some plot and some vaguely sketched Relationships.
But I could imagine what a grand novel it would have been had it been a lot of Relationships challenged and welded together by some vaguely sketched combat scenes.
But for what it is, this is a very good book.
Most readers will enjoy How The Multiverse Got Its Revenge by K Eason - even without reading the prequel.
I read it in small snatches because (well, life, you know) but every time I had a half hour, or thought I would, I came happily right back to this book to see what happens next.
The book is well written, powerfully plotted, but skips around point of view among several sub-groups of the main characters in the previous novel. It shows clearly how their team has remained intact, even though they split up physically at the end of the previous adventures. They won, and "retired' to new lives.
Only - well, life happens.
Now they are back at saving the Multiverse as they know it, with several species of people trying to form and hold profitable alliances. The narrative does not dwell on the politics -- you grasp the sparse sketch of the politics instinctively. It is a nicely set up situation that showcases the main characters combat abilities -- in skirmish after battle, after danger after near-miss.
So in a vague way, this novel does illustrate what happens when you mess with the Multiverse as these characters did in the prequel. But I didn't see that it really lived up to its title about the nature of reality, the nature of life, the definition of "person" and the adversarial relationship between Reality (or THE Multiverse) and a small group of unlikely friends and allies.
Given the title, Multiverse, I expected more modern science, math and theoretical physics explaining what the Multiverse is doing, why it is doing it, and what these characters can do about that.
Why "revenge" -- why is "the" Multiverse so petty, small, childish, petulant, and impotent? Only the truly impotent seek "revenge" so why would some Macrocosmic All regard this ragtag band of political adventurers as a threat to be swatted back at? None of those questions are addressed or answered or even sketched.
The definition of "revenge" is not addressed. That's what I kept coming back to the book looking for. It isn't there. The characters are (mostly ) good people pitted against people who somehow intend to destroy the comfortable existence of good people. That might be revenge - or maybe not. The theme is not clear.
But you won't get any real Romance out of it.