Irdi was one of the two larger moons of Vitea, sharing this with the moon Alfi. Although both moons were roughly the same size in terms of volume, Irdi was the heavier of the two, with a mantle and core comprised of highly dense helium, which was liquid or even solid. Irdi had volcanoes which spat out these substances instead of regular magma and lava. The atmosphere of Irdi was breathable for humanoids, but the moon evolved no intelligent life. Its core was severely ruptured during the Battle of Vitea and the near-loss of the sun Sandexi, causing its volcanoes to become more active.