The Pools of Flame and Tears
The most noticeable limitation in resources is the lack of any kind of wood. Displacer beasts are sources of valuable fur, leather, hide, and bone. Kragonscales are shed periodically throughout the life-cycle of a growing kragon. The nearest thing to cloth is the frond plant, used for most of the clothing in the Pools. Lava is a useful tool for slow-burning frond torches, producing the only light in the Pools.
Without cloth, there is nothing in the way of writing, other than stone carvings whose use has been limited to artwork and directions. There is little use for bows or crossbows in the densely packed caves, so these have not been invented.
While there is no wood, there is a plethora of minerals. The mines contain metals and gems that include gold, silver, gems, iron, copper, steel, and the incredible incendium. Incendium is used in place of wood wherever possible for crafting objects or weapons.