Prometia

Prometia is a planet that debuts in Season 8.

Overview
The planet is lit by Iridia, and has vast lands filled with vegetation which is currently dying due to the lack of light. There are also many natural hot springs and gysers from underground. It also has many light rubies far below the surface which can be harvested.

Society
Not much is seen in the series, however just like Iridia's Lumens, the people of Prometia hold strong grudges against Orion for essentially dooming the planet and its inhabitants, making him an outcast. It does appear to have much undeveloped land.

Winx Club

 * Orion

Trivia

 * It appears to be the only planet seen which does not have any light from its star