Spending months on elven tax codes and warp-drive schematics while Chapter One stays blank is worldbuilder's disease, and it kills more SFF projects than bad prose. This course teaches Mimi's system for creating deep, consistent worlds that thrill readers without endless rabbit holes. Learn the North-Star Statement to lock tone, premise, and scope. Use the World Compass to fence in what readers see now versus later. Master hard versus soft and top-down versus bottom-up approaches. Get genre-specific checklists for epic fantasy, grimdark, cozy fantasy, hard SF, and space opera. Build a story bible with Active Facts, Foundation Lore, and Deep Archives that feeds AI only the words it needs. Track revelations and power creep to prevent plot-breaking tangles. Instructor Mimi shares templates, AI prompt packs for Claude, GPT-4o, and Gemini, plus research links to NASA databases and world-culture references. Turn sprawling imagination into publishable settings without years of pre-writing.