Rokna tree fungus
Rokna tree fungus[1] was a deadly, blue fungus that grew on the rokna tree[2] found on the Forest Moon of Endor. The sharp points protruding from this fungus could cause the death of those coming in contact with them.[1] The addictive drug known as Rokna blue was derived from rokna fungus. The Ewok Deej Warrick once cut his arm on some rokna fungus.[1]
Behind the scenes
The To Save Deej storybook spells the fungus' name rockna. Rockna blue being derived from Rockna tree fungus is never explicitly stated in any source. Shield of Lies describes it as being made from 'a tree fungus that grows on endor', so it seems quite reasonable to presume that it comes from the tree fungus that shares its name, color, and poisonous properties.
Appearances
Ewoks—"To Save Deej" (First appearance)- To Save Deej (book) (Adaptation of To Save Deej episode)
- Shield of Lies (Indirect mention only) (as tree fungus that grows on Endor)