Made an AI dungeon master with Sonnet
The author has built a dark fantasy RPG called Warden, where the AI language model Claude Sonnet 4.5 acts as the game master. It's a browser-based, serverless application that requires the user's own Anthropic API key.
Why it matters
This project demonstrates the potential of AI language models like Claude to be integrated into interactive experiences, expanding the possibilities of game design and storytelling.
Key Points
- 1Warden is a dark fantasy RPG with Claude Sonnet 4.5 as the game master
- 2It has a 32-spell magic system with exhaustion mechanics and a procedural bestiary
- 3The prompt is a 3000-word system instruction that keeps Claude's responses concise
- 4State tracking uses structured tags parsed by JavaScript
Details
The author has developed a unique RPG experience by integrating the Anthropic AI language model Claude Sonnet 4.5 as the game master. Warden features a 32-spell magic system with exhaustion mechanics, where casting spells multiple times causes the player's hands to tremble and eventually collapse. The game also has a procedural bestiary with elemental weaknesses, alchemy, and faction reputation systems. The prompt is a detailed 3000-word instruction that keeps Claude's responses tight and concise, with a maximum of 70 words per response. The game uses structured tags that are parsed by JavaScript to track the game state, such as the start of combat or updates to the player's wealth. This approach allows for a narrative-driven experience without feeling rigid or scripted.
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