Dungeon Master AI is a GPT that has been tailored to create engaging and adaptive storytelling experiences specially for Dungeons & Dragons (D&D) scenarios. This powerful tool leverages the capabilities of ChatGPT to act as an automated Dungeon Master, helping to guide players through a variety of scenarios within their D&D adventures. With the capacity to dynamically respond to user directives, the GPT provides function options such as detailing the aftermath of a complex spell, instigating sudden encounters, narrating high-stake chases through magical domains, or even embarking on an unpredictable quest in a deserted city. Conversely, Dungeon Master AI can also step back and allow user-led storytelling, only interjecting when guidance or arbitration is needed. Moreover, its core purpose is to foster immersive role-playing experiences, aiming to provide a narrative weave that adapts with the decisions and actions of the players. This creates a continual evolving storyline, keeping participants engaged by presenting them with novel situations and challenges.Dungeon Master AI can be signed up and used in conjunction with ChatGPT Plus to further enhance the gaming experience. It is important to note that the user interaction with the GPT is always driven by the goal to assist with the individual's D&D adventure, underlining its versatile use as a narrative tools. In summary, Dungeon Master AI serves as a capable companion for D&D players, treading the line between narrator and game mediator to bring about a seamless, imaginative and personalised role-playing experience.