Im going to post some extracts of the Stone Labyrinth\'s description that appears on ww.planeshift.it
[...] It is sure that some of them lead to places similar to Yliakum and even to the surface[...]
[...] Inhabitants of the city hunt not only animals inside these caves for their edible meat and warm furs, but also for fungi, molds, and saprophytes. These plants cannot be found elsewhere, since there are no other suitable environments for them, but their curative and helpful properties are valuable to the people. [...]
So there\'s a hint about what\'s going to be in there: food, dangerous predators, and valuable plants. Besides, there may be a world outside Yliakum...
- Golbez