Urnsor'is
this unusual race of parasitic creatures was discovered on the planet Kashyyyk, several years before the onset of the Clone Wars, although it was unknown whether they were native to the planet or not. An Urnsor'is egg was discovered by an adolescent Wookiee of the Myyydril tribe, and was allowed to hatch in their caves. The young creature, which resembled a large brain that moved about on a collection of tentacles, fled the Wookiee caves and found its own cave, where it seemed to spontaneously lay more eggs. These hatched over time, until they were discovered by the Myyydril Wookiees. These Wookiees witnessed their comrades being captured by the Urnsor'is, with the parasite latching itself onto the Wookiee's skull and feeding on them. The Wookiees named the creatures Urnsor'I which meant "mind pod" in their language. The Wookiees believed that the Urnsor'is were sentient, especially after the Urnsor'is began purposely capturing and killing more Wookiees. The Wookiees tried to fight back, but normal weapons seemed ineffective against the Urnsor'is. Only Nak'tra Crystals seemed to able to kill Urnsor'is.