Ytima

Ytima, known by the Ancients as Nibiru, is the largest satellite of Nadir, and one of mysterious origins.

Features
Ytima is a true celestial nightmare. Only paintings exist of this moon, as no one has truly gotten to see it up close. Its landscape consists of crimson, smog-choked skies, seas of blood and pus, monolithic structures and mountains resembling disembodied limbs, and canyons with eyeballs and teeth in the walls. Many theorize this moon to be an artificial construct or maybe even the cursed homeworld of the Ancients. Others point to this moon as being an alien creature of a truly colossal size.