The thernbee was a psychic entity of significant size, distinguished by its white hair and semi-sentient nature. These creatures, which possessed the ability to communicate through psychic visions, inhabited the mountainous regions of Almania. Their hair, which was white, would shed frequently, resulting in a patchy coat and the exposure of pink skin.
These playful beings were known to engage in sadistic games with their prey before killing them. Their saliva contained anesthetic properties, capable of numbing the senses of their victims. As omnivores, they consumed a diet consisting of small animals, vegetation, and fruits.
Kueller possessed several of these creatures, and one of them consumed a ysalamir while it was generating a Force bubble.
Furthermore, Kueller confined Luke Skywalker within a cage alongside a thernbee. Remarkably, the thernbee aided Luke in treating the wounds he sustained from the explosion of his X-Wing, utilizing the anesthetic present in its saliva. Communicating telepathically, the thernbee collaborated with Luke to devise an escape plan. They successfully executed their plan, only to encounter stormtrooper guards. The thernbee swiftly eliminated the guards, after which it and Luke parted ways.