I think that the strength of fantasy is its limitless possibility. You can create places, creatures, and powers that don’t need to be real to be believed. I can do pretty much whatever I want, and I don’t even have to think, is this possible? Anything is possible, and that includes whatever story I want to tell, in whatever world or setting I want to use. That can be a good thing, but it can also be confusing. It’s very easy to make mistakes. Magic is allowed, of course, but what kind of magic is it? Who can perform it? How is it performed? If the answers to those questions vary throughout the book, then the story doesn’t work. Writing fantasy is a delightful challenge that lets the imagination journey far and wide, and come back with incredible tales to tell. It just requires careful revision and professional editing, which every book should enjoy.