Try Rain World:

https://rainworldgame.com/

Not an RPG and no quests but it has some of the most well-done game AI in any game I have ever played. Basically every mob in the game has its own goals and goes about fulfilling them regardless of what the player is doing, and where the player is etc. It's more like a simulated environment and the game drops you in the middle of it and you have to learn how the world works, navigate and survive it.

It's not even any kind of advanced technology, just how fun game AI can be if a developer gives it sufficient attention, instead of basically bodging together some behaviour trees and calling it a day while spending all the compute and development budget for graphics. That's one reason why game AI sucks so much most of the time.

Another reason is that players themselves don't want convincing enemies in a convincing environment. I always recall a review of Rain World where the game critic threw his controller because he thought the enemies respawn randomly when the player dies, thus depriving the game critic from the opportunity to memorise their "patterns". In truth, the enemies don't "respawn" they just go about their business while the player is regenerating and so they're not always where you last left them when you return at the spot you died. The world keeps turning when you're gone. So you do have to learn their "patterns" except those patterns are not trivial patrol cycles but actual, you know, behaviours.

But, no. That won't do. Give us a game where we can memorise every telegraphed attack so we know when to press which button with millisecond precision like a mindless automaton.

Sorry, little rant there. I'm saying that many gamers and many devs don't actually want decent, convincing game AI.