- "You look at the history of any sentient species and what do you find but tableaux of violence and slaughter. It's finger painted on the ceilings of caves…"
- ―Lt. Cmdr. Orson Krennic of the Galactic Empire
A cave, also known as a grotto was a void in a section of rock or dirt. Some caves, often called caverns, were large enough for sentient life to build cities in them. The surface of the planet Bilzen was covered in frozen caverns.
- Star Wars: Complete Locations
- Star Wars: The Last Jedi: The Visual Dictionary
- Dawn of Rebellion
- Star Wars: The Complete Visual Dictionary, New Edition
- Star Wars: Alien Archive (First identified as grotto)
- Ultimate Star Wars, New Edition
- Star Wars: The Secrets of the Jedi