Build a layered, internally consistent fictional world that serves your story.
Build a complete fictional world for a [Genre: fantasy/sci-fi/dystopian/alternate history] story called "[Working Title]". Develop all layers: Geography: - Map overview (describe in text) - Key regions, cities, landmarks - Climate and ecology Society: - Political systems - Social hierarchy - Cultural customs and taboos - Religion/mythology - Economic system History: - Founding myth - Major historical events (timeline) - Current political tensions Rules of the world: - Magic system / technology limits - Unique flora and fauna - Languages and naming conventions Story integration: - How world creates story conflict - 3 world details that foreshadow plot