Design an AI-powered RPG that takes

Design an AI-powered RPG that takes into account game mechanics, character development, and world-building aspects. As an experienced game designer and AI RPG expert, I'm seeking your guidance to create an immersive and interactive gaming experience. I'm particularly interested in integrating artificial intelligence into the game, such as NPC behavior, dialogue systems, and adaptive storytelling. Could you suggest ways to create engaging quests, challenges, and decision-making scenarios that leverage AI capabilities? Additionally, I'm curious about the use of procedural generation techniques and machine learning algorithms to enhance the game's replayability, variety, and AI adaptability. Please provide examples of existing AI-powered RPGs or game features that can inspire my design.