Umbraspider

Umbraspiders were a species of spider which produced silk that refracted and absorbed light in such a way that it was nearly invisible to the naked eye unless seen in bright light. The spiders used this silk to make webs; however, it was also harvested and used by members of the sentient Sakiyan species to produced Sakiyan shadowsuits. The company Ayelixe/Krongbing Textiles employed chemists to synthesize a material similar to the webbing known as shadowsilk which they also used to make shadowsuits, but the Sakiyan's maintained that Umbraspider silk was superior to the synthetic material.

Behind the scenes
Umbraspiders were first created for Lords of Nal Hutta, a supplement book produced for Fantasy Flight Games' Star Wars: Edge of the Empire roleplaying game. The book was released in 2015 and was written by Max Brook and Sterling Hershey.