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I don't see any problem in creating a supercool world where there is magic, technology, and all sort of fun things. The main issue is its execution. There has to be a compelling story apt for that ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/29637 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I don't see any problem in creating a supercool world where there is magic, technology, and all sort of fun things. The main issue is its execution. There has to be a compelling story apt for that setting to bring the world alive. That depends mostly on the writing and how the writer incorporates it in the story. If there is a complex world to begin with, it must come to life via its characters, thier motivation, desires, and shortcomings. The complexity of the world will not amuse the readers if they don't connect to the story. World building is the physical body of the novel, which means nothing without its story–its soul. How well the audience accepts the fictional world solely depends on the ability of the author to pull it off with his writing.