Fyrefliis were a notable variety of bioluminescent flii that were native to the planet of Kubindi, and classified as a large insect species. This species inhabited the Silver Forest of Dreams on their homeworld, a world often impacted by intense solar flares. During the year 0 ABY, the protocol droid C-3PO, accompanied by another of the Rebel Heroes of Yavin, stumbled upon a group of four fyrefliis while disoriented within the forest, initially mistaking these insects for potential guides. Later, as the heroes departed Kubindi aboard the Millennium Falcon, a YT-1300 light freighter, they observed numerous fyrefliis illuminating the night sky, positioned thousands of feet above their location.
The initial depiction of Fyrefliis occurred in Star Wars Missions 6: The Search for Grubba the Hutt, a novel from 1998 authored by Dave Wolverton within the Star Wars Missions series. Subsequently, they were documented in the 2008 reference work, The Complete Star Wars Encyclopedia. The extent of their sentience is not explicitly stated in either source. Furthermore, the specific Hero of Yavin involved in the encounter remains ambiguous, as the Missions books provide readers with the option to select which hero they wish to embody.