Has anyone attempted games procedurally-generated by AI?

I know people are already creating NPCs with local models but I'm talking about AI-generated games that would continue creating content forever, a "non-deterministic" self-expanding game built by an AI that creates endless narrative, so to speak.

I think the easiest example for me to visualize would be an endless war in a procedurally-generated landscape where every time you defeat an enemy, such as a captain, a general, etc. A new enemy pops up on the horizon with a different …

artificial example game games generated narrative npcs people speak think war