Illudium was a Lambda-class T-4a shuttle of the same group as Tydirium. It was found in Outpost 327 when the latter was captured in the Mission to Zhar.

Behind the scenesEdit

All the shuttles in the Outpost share names with real-life or fictional elements. "Illudium" is an obscure fictional element mentioned in the Marvin the Martian cartoons in the form of the "Illudium Q-36 Explosive Space Modulator".