Spellwright

In Spellwright you write your own spells. It is a multiplayer wizard arena where, instead of picking from a fixed list, you type a prompt describing what you want to cast, and an AI model generates the spell on the spot. Then you fight rival wizards with it.

The creator's goal was a game powered fully by language model inference at run time, built with Claude Code on Three.js to run in mobile browsers too. In Vibe Jam 2026 it came 117th of 945. Because spells come from whatever players type, the results are chaotic and hard to predict.

Then the physics takes over. Each spell plays out in a physics-driven arena fight, and when effects collide, the simulation adds its own disorder to whatever the model produced.