World Builder is a GPT designed to assist users in constructing detailed and intricate imaginary worlds. Users are prompted to initiate the GPT with their worldview or concept, and the GPT then aids in further development and visualization of this idea. The intelligent nature of this tool allows it to be quite versatile and adaptable to a myriad of imaginative scenarios. The functionality encompasses a broad spectrum of world-building aspects, such as generating landscapes for magic kingdoms, designing societies of elves and living trees, visualizing the livelihood of a group of assassins living underground, or describing the natural habitat of a half-wolf-half-cat creature. The tool interacts by using ChatGPT to intelligently and creatively expand on the initial input. By processing and understanding the given scenario, it provides a detailed portrayal of the imaginary world. The user is then free to further refine and add more details to the AI-generated concept. As a result, World Builder acts as a useful aid for fantasy writers, game designers, role-playing enthusiasts, and other creative individuals who need to create detailed and coherent world settings. This GPT encourages the exploration of unique and innovative ideas for world creation by pushing the boundaries of imagination.Users need to sign up for the application, and the application operates under the 'ChatGPT Plus' model. However, unlike traditional world-building tools, World Builder leverages the vast AI capabilities of GPT to provide a responsive and fluid creation process.