Magic Versus Grounding
How do you like to write your fiction? Do you like magical settings and characters, or do you like some grounding elements that may give the story more realism? I would choose one or the other for good continuity. The Harry Potter books are a good example of magical worlds. Stephenie Meyer’s Twilight Saga is an example of grounding a magical and fictional world. She gave her vampires and werewolves characteristics of nature or used cultural folklore to make her settings and characters more real to the reader.
To ground a fictional story you can utilize science as well. You can stretch the imagination of the reader but still keep a small piece tied to the ground.