The gobblers want to stay in wizard city because "mean witches," have taken over their world.
That sounds like a good place to build a plot from. I was playing on one of my younger wizards when I talked to The Gobbler King. I had compleatly forgotten about their witch infested world by the time I had made it to dragon spire.
I know the gobbler's world doesn't sound exotic, even if witches have twisted it, but it is a world in the spiral that we know about.