Imagine a role-playing game where the story isn't fixed, but morphs and twists based on your choices. That's the promise of PANGeA, a new AI system that acts like a dynamic game master, crafting unique narratives for turn-based RPGs. Traditional RPGs often rely on pre-written storylines, limiting player agency. PANGeA breaks free from these constraints, using large language models (LLMs) to generate everything from settings and characters to dialogue and plot twists, all in real-time. One of the biggest challenges in using LLMs for dynamic storytelling is keeping the narrative on track. A player's free-form input can easily lead the story into unexpected and sometimes nonsensical territory. PANGeA tackles this with a clever "validation system." It's like having a built-in editor that checks player input against the established game rules and lore. If a player tries to do something that doesn't make sense within the narrative, the system gently nudges them back on course, ensuring a cohesive and engaging experience. But PANGeA goes beyond just keeping the story coherent. It also breathes life into the game's characters. Using the "Big Five" personality model, PANGeA creates NPCs with distinct personalities that shape their interactions with the player. Imagine interrogating a suspect who's naturally agreeable versus one who's neurotic – the conversations would unfold in entirely different ways, adding depth and realism to the game. To avoid overwhelming the LLM with too much information, PANGeA uses a memory system inspired by how human memory works. It stores both short-term and long-term memories of events and conversations, allowing the AI to maintain narrative consistency even over extended gameplay. PANGeA was tested in a prototype detective game called "Dark Shadows," where it generated dynamic evidence, engaging dialogue, and personality-driven NPC interactions. Further testing across various RPG scenarios, from medieval fantasy to sci-fi, showed that PANGeA's validation system significantly improved the narrative coherence, even with smaller, more accessible LLMs. This opens up exciting possibilities for bringing AI-powered storytelling to a wider range of devices, including mobile phones. While PANGeA is a significant step forward, there are still challenges to overcome. The system is susceptible to the biases present in the underlying LLMs, and ethical considerations need further exploration. However, PANGeA represents a promising future for RPGs, where the story is as dynamic and unpredictable as the players themselves.