You start down the crystalline tunnel but slip & begin sliding along for several yards. The trip was exhilarating, especially as most of the "slide" was a passage through a humongous geode. You are glad that the crystal making up the tube you traverse is thick once you notice the sharp & spiky bits outside. The tube end brings you to a deep cave that is home to an abandoned dragon nest. Phosphorescent lichen lines the walls providing enough light to see by. Aside from egg fragments in a rocky depression, there is nothing in the cavern. Thankfully the crystal tube was not so steep or slick that you couldn't climb back up without too much effort.