I have never used an LLM for fictional writing, but I have been writing large amounts of code with them for years. What I'd recommend is when you're defining yo

I have never used an LLM for fictional writing, but I have been writing large amounts of code with them for years. What I'd recommend is when you're defining your plan up front as to the sections of the content, simply state in which phase / chapter of the content they should meet. Planning generated content is often more important to invest in than the writing of it. Looking at your paste, your prompt is short and basic, it should probably be broken up into clear, formatted sections (try directives inside XML style tags). For such a large output as you're expecting id expect a considerable prompt of rules and context setting (maybe a page or two).