The crystal cave is a storied place hidden and tucked into the spire north of Cotra, in the Eastern Gallery of Exile. It is a large cave filled with unusually large, flawless, quartz crystals that together reflect a rainbow of light. The crystals constantly hum with energy, and have a restorative effect on those who are in the cave. It is not known why the crystals hum.
In the early days of Avernum, many sought to find the cave for its healing properties. In 817 IE, the cave was vandalized and several crystals were spirited away. Hawthorne's Assassins were somehow able to repair the cave. Recent reports indicate that the magic of the cave is fading.