It is densely populated with [[:Category:Light Crystal|light crystalcrystals]]s which naturally emit light in one of 3 different colors. This is the only place in the game light crystals appear.<br>Unlike the rest of the tunnels, the crystal caves are populated with extremely tough enemies you would be unlikely to find up until the deeper floors of the [[Gloomy Cave]]. The player is advised to use caution, as three light crytal golems [[golem]]s (one for each color) are guaranteed to spawn on this floor.

*The crystal cave was intended to be the home of [[Lobh-se]] the spider queen, hence the copious amount of spiders that spawn. Some variants (such as [[LIVAN]]) have added Lobh-se to the game on a fifth floor.