Calypso: LLMs as Dungeon Masters' Assistants A new tool called Calypso is capturing the attention of both Dungeons & Dragons (D&D) enthusiasts and tech aficionados. Calypso leverages large language model (LLM) technology to provide real-time assistance to game masters (DMs), making it easier for them to manage complex tabletop role-playing games (RPGs). Dungeons & Dragons is a globally popular tabletop RPG where players create characters and embark on adventures in a fictional world. During the game, a DM is responsible for controlling non-player characters (NPCs), describing scenes, and enforcing game rules. For many new DMs, the challenge of juggling multiple tasks, maintaining a coherent story, and handling unexpected player actions can be daunting. In a paper, the developers of Calypso detail the tool's features and design philosophy. Calypso is designed to offer real-time suggestions to help DMs develop the story, generate vivid scene descriptions, and produce contextually appropriate NPC dialogue. It also assists in quickly referencing game rules, reducing the likelihood of misjudgments. Calypso relies on advanced LLMs, such as OpenAI's GPT-3 and Anthropic's Claude. These models are trained to understand complex character backstories, game settings, and player behavior, enabling Calypso to provide highly personalized and real-time support to DMs. Preliminary tests have shown that Calypso can significantly enhance the game's flow and player experience. Many DMs report that using Calypso allows them to focus more on creative storytelling and player reactions, rather than being bogged down by intricate rules and detailed scene settings. This not only eases their burden but also makes the game more engaging and enjoyable. Currently, Calypso is still in the development phase, but the creators aim to release a beta version in the coming months to allow more players to test it and provide feedback. They believe that the integration of LLMs into tabletop RPGs will breathe new life into this traditional form of gaming. For tech enthusiasts interested in the DM role, Calypso is more than just a practical aide; it demonstrates the vast potential of LLMs in creative and interactive tasks. As technology continues to evolve, future tabletop RPGs may become even more intelligent and personalized, offering players a wealth of surprises and a deeper sense of immersion.