The legendary Ghost Wookiee was rumored to be a furious Wookiee specter haunting the world of Kashyyyk, where it would assault anyone passing through. During a Kashyyyk excursion in 196 BBY, Egon recounted this tale to a group of fellow padawans, leading them to flee their campsite after they confused the Jedi Kitmum with the spectral Wookiee.
The initial reference to the Ghost Wookiee appeared in Jeffrey Brown's 2013 book, Jedi Academy.