So this was another idea I had the brief time I was working on UN - the inspiration is Saltybet. Saltybet is a website that uses the fighting game/fighting game engine "Mugen" to let people gamble on matches between AI controlled characters. What makes it interesting is that Mugen is a unique engine that allows for custom made characters - not just appearance, but entirely player made moves and attacks and properties. Thus in Saltybet, unless you've seen the character before, you're betting on a mystery.
How this ties into Graal, is this. An underground "fight club" looking level, meant to look dark, dank, and out of the way. In sewers, perhaps? Here, players would gather to bet on periodic fights between NPC baddies. The baddies would be randomly generated from several templates. Their appearance would be assembled from an assortment of baddy "part" graphics (head, body, arms, weapon appearance, etc). Their attacks would be based on loadouts (sword/shield, archer, bomb, firearrow/dragon, etc). The way they fight would be based on a personality (brave ones would be more likely to try and corner another baddy, cowardly ones would often flee with their back to the other, strategic ones would flee backwards, etc). Occasionally "top tier" baddies would be thrown in, with preset appearance/attacks/AI to represent a player, a major NPC character, or just a gimmicked enemy. I don't know how feasible this would be here, but scripters on UN suggested that this kind of AI vs AI battling was doable.
Anyway, it's nothing that would make an impact on the game now, but maybe in the future something like this could give players something to do independent of questing or hosted events.