The Dungeon Master's Guide is a GPT developed by Nikita Vorontsov that serves as a proficient tool for Dungeons and Dragons (D&D) world creation. This GPT is designed to assist with the creation of story arcs, encounters, non-playable characters, and settlements, hence, providing a comprehensive world-building experience. It is adept at creating engaging narratives and fostering immersive gameplay, making it an essential tool for any D&D Dungeon Master (DM). By using specific prompt starters like '!storyarc', '!lethality', '!npc', and '!settlement', users can get help in crafting various elements of a D&D campaign. For example, '!storyarc', followed by character name and level range, can be used to create a dynamic story arc, while '!lethality', followed by encounter difficulty, can help in designing appropriate encounters. '!npc' and '!settlement', followed by verbosity, can assist in developing non-playable characters and settlements respectively. These prompt starters simplify DMs' jobs by offering structured guidance and imbuing their D&D campaigns with compelling depth and variety. The Dungeon Master's Guide requires ChatGPT Plus, the primary GPT, to be utilized to its full extent. To participate in the immersive and engaging D&D world creation that the Dungeon Master's Guide enables, users need to sign up and get started with the available prompt starters.