Zelenie is a star that fits in the Spectrum pattern exhibited on Dex's list from his universe assignment in Book 1: Keeper of the Lost Cities. After Sophie had concluded that the pattern was the colors of the spectrum and Dex realized green was the missing value, Dex instantly thought of Zelenie. Unlike the stars Sophie was assigned, the star caused no mental strain to locate, and Sophie was able to point to it as soon as its name was brought up. It resides in the left region of the sky, isolated from other stars. The other stars on the list were Rubini, Cobretola, Orroro, Azulejo, Indigeen, and Amaranthis.